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EU member states use a common passport design, burgundy coloured with the name of the member state, coat of arms and the title "European Union" (in the language(s) of the issuing country).

Citizenship of the European Union was introduced by the Maastricht Treaty, which was signed in 1992, and has been in force since 1993. European Union citizenship is supplementary to national citizenship and affords rights such as the right to vote in European elections, the right to free movement, settlement and employment across the EU, and the right to consular protection by other EU states' embassies when a person's country of citizenship does not maintain an embassy or consulate in the country they need protection in.

History

EU citizenship as a distinct concept was first introduced by the Maastricht Treaty, and was extended by the Treaty of Amsterdam. Prior to the 1992 Maastricht Treaty, the European Communities treaties provided guarantees for the free movement of economically active persons, but not, generally, for others. The 1951 Treaty of Paris establishing the European Coal and Steel Community established a right to free movement for workers in these industries and the 1957 Treaty of Rome provided for the free movement of workers and services.

However, the Treaty provisions were interpreted by the European Court of Justice not as having a narrow economic purpose, but rather a wider social and economic purpose. In Levin, the Court found that the "freedom to take up employment was important, not just as a means towards the creation of a single market for the benefit of the Member State economies, but as a right for the worker to raise her or his standard of living". Under the ECJ caselaw, the rights of free movement of workers applies regardless of the worker's purpose in taking up employment abroad, to both part-time and full-time work, and whether or not the worker required additional financial assistance from the Member State into which he moves. Since, the ECJ has held that a recipient of service has free movement rights under the treaty and this criterion is easily fulfilled, effectively every national of an EU country within another Member State, whether economically active or not, had a right under Article 12 of the European Community Treaty to non-discrimination even prior to the Maastricht Treaty.

In Martinez Sala, the European Court of Justice held that the citizenship provisions provided substantive free movement rights in addition to those already granted by Union law.

Stated rights

Historically, the main benefit of being a citizen of an EU state has been that of free movement. The free movement also applies to the citizens of European Economic Area states and Switzerland. However with the creation of EU citizenship, certain political rights came into being. The Treaty on the Functioning of the European Union provides for citizens to be "directly represented at Union level in the European Parliament", and "to participate in the democratic life of the Union" (Treaty on the European Union, Title II, Article 10). Specifically, the following rights are afforded;

Political rights

• Voting in European elections: a right to vote and stand in elections to the European Parliament, in any EU member state (Article 22)
• Voting in municipal elections: a right to vote and stand in local elections in an EU state other than their own, under the same conditions as the nationals of that state (Article 22)
• Accessing European government documents: a right to access to European Parliament, Council, and Commission documents (Article 15).
• Petitioning Parliament and the Ombudsman: the right to petition the European Parliament and the right to apply to the European Ombudsman in order to bring to his attention any cases of poor administration by the EU institutions and bodies, with the exception of the legal bodies (Article 24)
• Linguistic rights: the right to apply to the EU institutions in one of the official languages and to receive a reply in that same language (Article 24).

Rights of free movement

• Right to free movement and residence: a right of free movement and residence throughout the Union and the right to work in any position (including national civil services with the exception of those posts in the public sector that involve the exercise of powers conferred by public law and the safeguard of general interests of the State or local authorities (Article 21) for which however there is no one single definition);
• Freedom from discrimination on nationality: a right not to be discriminated against on grounds of nationality within the scope of application of the Treaty (Article 18);

Rights abroad

• Right to consular protection: a right to protection by the diplomatic or consular authorities of other Member States when in a non-EU Member State, if there are no diplomatic or consular authorities from the citizen's own state (Article 23): this is due to the fact that not all member states maintain embassies in every country in the world (16 countries have only one embassy from an EU state).

Free movement rights

Article 21 Freedom to move and reside

Article 21 (1) of the Treaty on the Functioning of the European Union states that

Every citizen of the Union shall have the right to move and reside freely within the territory of the Member States, subject to the limitations and conditions laid down in this Treaty and by the measures adopted to give it effect.

The European Court of Justice has remarked that,

EU Citizenship is destined to be the fundamental status of nationals of the Member States

The ECJ has held that this Article confers a directly effective right upon citizens to reside in another Member State. Before the case of Baumbast, it was widely assumed that non-economically active citizens had no rights to residence deriving directly from the EU Treaty, only from directives created under the Treaty. In Baumbast, however, the ECJ held that (the then) Article 18 of the EC Treaty granted a generally applicable right to residency, which is limited by secondary legislation, but only where that secondary legislation is proportionate. Member States can distinguish between nationals and Union citizens but only if the provisions satisfy the test of proportionality. Migrant EU citizens have a "legitimate expectation of a limited degree of financial solidarity... having regard to their degree of integration into the host society" Length of time is a particularly important factor when considering the degree of integration.

The ECJ's case law on citizenship has been criticised for subjecting an increasing number of national rules to the proportionality assessment.

Article 45 Freedom of movement to work

Article 45 of the Treaty on the Functioning of the European Union states that

1. Freedom of movement for workers shall be secured within the Union.
2. Such freedom of movement shall entail the abolition of any discrimination based on nationality between workers of the Member States as regards employment, remuneration and other conditions of work and employment.

State employment reserved exclusively for nationals varies between member states. For example, training as a barrister in Britain and Ireland is not reserved for nationals, while the corresponding French course qualifies one as a 'juge' and hence can only be taken by French citizens. However, it is broadly limited to those roles that exercise a significant degree of public authority, such as judges, police, the military, diplomats, senior civil servants or politicians. Note that not all Member States choose to restrict all of these posts to nationals.

Much of the existing secondary legislation and case law was consolidated in the Citizens' Rights Directive 2004/38/EC on the right to move and reside freely within the EU.

Limitations

New member states may undergo transitional regimes, during which their nationals only enjoy restricted access to labour markets in other member states. EU member states are permitted to keep restrictions on citizens of the newly acceded countries for a maximum of seven years after accession. For the EFTA states (Iceland, Lichtenstein, Norway and Switzerland), the maximum is nine years.

Following the 2004 enlargement, three "old" member states—Ireland, Sweden and the United Kingdom—decided to allow unrestricted access to their labour markets. By December 2009, all but two member states—Austria and Germany—had completely dropped controls. These restrictions too expired on 1 May 2011.

Following the 2007 enlargement, all pre-2004 member states except Finland and Sweden imposed restrictions on Bulgarian and Romanian citizens, as did two member states that joined in 2004: Malta and Hungary. As of November 2012, all but 8 EU countries have dropped restrictions entirely. These restrictions too expired on 1 January 2014. Norway opened its labour market in June 2012, while Switzerland and Lichtenstein may keep restrictions in place until 2016.

Following the 2013 enlargement, some countries implemented restrictions on Croatian nationals following the country's EU accession on 1 July 2013. As of July 2013, all but 13 EU countries have dropped restrictions entirely. The UK Home Office has announced a bill to this effect.

Acquisition

There is no common EU policy on the acquisition of European citizenship as it is supplementary to national citizenship (one cannot be an EU citizen without being a national of a member state). Article 20 (1) of the Treaty on the Functioning of the European Union states that:

"Citizenship of the Union is hereby established. Every person holding the nationality of a Member State shall be a citizen of the Union. Citizenship of the Union shall be additional to and not replace national citizenship."

While nationals of Member States are citizens of the union, "It is for each Member State, having due regard to Union law, to lay down the conditions for the acquisition and loss of nationality." As a result, there is a great variety in rules and practices with regard to the acquisition and loss of citizenship in EU member states.

Exceptions for overseas territories

In practice this means that a member state may withhold EU citizenship from certain groups of citizens, most commonly in overseas territories of member states outside the EU.

For example, owing to the complexity of British nationality law, a 1982 declaration by the UK government defined who would be deemed to be a British "national" for European Union purposes:

• British citizens, as defined by Part I of the British Nationality Act 1981.
• British subjects, within the meaning of Part IV of the British Nationality Act 1981, but only if they also possess the 'right of abode' under UK immigration law.
• British overseas territories citizens who derive their citizenship by a connection to Gibraltar.

This declaration therefore excludes from EU citizenship various historic categories of British citizenship generally associated with former British colonies, such as British Overseas Citizens, British Nationals (Overseas), British Protected Persons and any British subject which does not have the 'right of abode' under UK immigration law.

In 2002, with the passing of the British Overseas Territories Act 2002, EU citizenship was extended to almost all British overseas territories citizens when they were automatically granted full British citizenship (with the exception of those with an association to the British Sovereign Base Areas of Akrotiri and Dhekelia on the Island of Cyprus). This has effectively granted them full EU citizenship rights, including free movement rights, although only residents of Gibraltar have the right to vote in European Parliament elections. In contrast, British citizens in the Crown Dependencies of Jersey, Guernsey and the Isle of Man have always been considered to be EU citizens but, unlike residents of the British overseas territories, are prohibited from exercising EU free movement rights under the terms of the UK Accession Treaty. (see Guernsey passport, Isle of Man passport, Jersey passport).

Another example are the residents of Faroe Islands of Denmark which, though in possession of full Danish citizenship, are outside the EU and are explicitly excluded from EU citizenship under the terms of the Danish Accession Treaty. This is in contrast to residents of the Danish territory of Greenland who, whilst also outside the EU as a result of the 1984 Greenland Treaty, do receive EU citizenship as this was not specifically excluded by the terms of that treaty (see Faroe Islands and the European Union; Greenland and the European Union).

Summary of member states' nationality laws

This is a summary of nationality laws for each of the twenty-eight EU member states.

Member State		Acquisition by birth	Acquisition by descent	Acquisition by marriage	Acquisition by naturalisation	Multiple nationality permitted
Austria		Persons born in Austria: at least one of whose married parents is an Austrian citizen out of wedlock and whose mother is Austrian citizen who is foundling and is found out under the age of 6 months	Austrian nationality is acquired by descent under one of the following conditions: Conditions born to Austrian parents born after January 9, 1983 and if parents are married at the time of birth, Austrian citizenship of either the mother or the father is sufficient born before or on January 9, 1983: father must have been an Austrian citizen; children born to an Austrian mother married to a non-Austrian father do not qualify. If parents are not married, however, a father cannot pass on Austrian citizenship, whereas a mother can should the parents happen to marry at some time after birth, citizenship is automatically granted to child retroactively. If the child is over 14 at that time, child's consent is needed.	6 years' residence if married for at least 5 years (and general citizenship conditions are met, including German language proficiency)	6 years' residence if born in Austria, citizen of another EEC country, granted asylum, or "exceptionally integrated" depending on fulfillment of other conditions, up to 30 years' residence	Only allowed with special permission or if dual citizenship was obtained at birth (binational parents [one Austrian, one foreign] or birth in a jus-soli country such as USA and Canada)
Belgium		Persons born in Belgium who: are stateless are foundlings lose any other nationality before 18 have a parent born in Belgium have a birth or adopted parent resident in Belgium for at least 5 of the past 10 years	Belgian nationality is acquired by descent under one of the following conditions: Belgian citizen father	是—after 3 years cohabitation in Belgium	5 years' residence—can petition federal government 10 years' residence—automatic by request at city hall 2 years' residence (stateless persons)	是
Bulgaria		Persons born in Bulgaria who: are stateless are foundlings	Bulgarian nationality is acquired by descent under one of the following conditions: Conditions At least one parent is a Bulgarian citizen Any person of Bulgarian ethnicity; Also, member of a historical Bulgarian ethnic community (e.g. in Macedonia, Ukraine, Moldova) (no limit on number of generations).	The applicant should be at least 18 years old; have permission for permanent or for long-term residence in Bulgaria since at least 3 years; have not been investigated or sentenced by the Bulgarian authorities; have income or occupation; be able to speak and write in Bulgarian; renounce previous citizenship (not applicable to citizens of the EU and EEA countries, Switzerland and countries with reciprocity agreement with Bulgaria; dual citizenship is allowed for them); have marriage to Bulgarian citizen since at least 3 years and the marriage is actual.	The applicant should be at least 18 years old; have permission for permanent or for long-term residence in Bulgaria since at least 5 years; have not been investigated or sentenced by the Bulgarian authorities; have income or occupation; be able to speak and write in Bulgarian; renounce previous citizenship (not applicable to citizens of the EU and EEA countries, Switzerland and countries with reciprocity agreement with Bulgaria; dual citizenship is allowed for them).	Yes - for Bulgarian citizens by birth; Yes - for naturalized citizens of the EU and EEA countries, Switzerland and countries with reciprocity agreement with Bulgaria
Croatia		Persons born in Croatia: At least one parent is a Croatian citizen who is foundling (but such citizenship can be revoked if later established both parents were foreign citizens)	Croatian nationality is acquired by descent under one of the following conditions: Conditions: born to Croatian parents born after March 1, 1991 and if parents are married at the time of birth, Croatian citizenship of mother the father is required should the parents happen to marry at some time after birth, citizenship is automatically granted to child retroactively. If the child is over 14 at that time, child's consent is needed. ?	8 years' residence (can be shortened)	8 years' residence sufficient knowledge of Croatian language	是, but persons seeking to become Croatian citizens by naturalisation are to renounce foreign citizenship unless applying by 'privileged naturalisation' (e.g. descendants of Croatian emigrants)
Cyprus		Persons born in Cyprus who: are stateless are foundlings	Cypriot nationality is acquired by descent under one of the following conditions: Conditions born to Greek Cypriot parent(s) born to Turkish Cypriot parent(s) after 1974 whose parent(s) was/were citizen of the Republic prior to 1974 Turkish Cypriots who have lost their citizenship after the occupation in 1974 born to a Turkish Cypriot parent and a Turkish parent if the Turkish parent is not a settler after 1974 (marriage must not have taken place in Northern Cyprus after 1974)	3 years' residence	7 years' residence	是
Czech Republic		Persons born in the Czech Republic: who are foundlings whose parents are both stateless, and at least one of whom is a Czech permanent resident		否	Holders of a Czech permanent residence permit for at least 5 years	是, effective January 1, 2014
Denmark		Persons born in Denmark who: are foundlings	Danish nationality is acquired by descent under one of the following conditions: The child's mother is a Danish citizen; The child's father is a Danish citizen and the parents are married;	6 years' residence if married for at least 3 years	9 years' residence (holders of a permanent residence permit) 8 years' residence (refugees and stateless persons)	是, effective September 1, 2015
Estonia		Persons born in Estonia who: are foundlings	Persons who have at least one parent with Estonian citizenship.	No (unless married to an Estonian citizen before 26 February 1992)	8 years' residence	No (although Estonian citizens by descent cannot be deprived of their Estonian citizenship)
Finland		Persons born in Finland who: are stateless, or are foundlings	Finnish nationality is acquired by descent under one of the following conditions: Conditions The child's mother is a Finnish citizen; the child's father is a Finnish citizen and the parents are married; the child's father who died before the child was born was a Finnish citizen and who was married to the child's mother at the time of his death; or the child's father, who died before the birth of the child, was a Finnish citizen and the child was born in Finland out of wedlock and the father's paternity was established.	Minimum residence requirement of four years of residence.	Five years of residence (or a total of seven years of residence since age 15) in Finland; and knowledge of at least one of Finnish, Swedish or Finnish sign language. Reductions apply under certain conditions.	是
France		At birth, persons born in France who: are stateless, or have a parent born in France At 13, persons born in France upon the parent's request. At 16, persons born in France upon their own request. At 18, persons born in France who: have resided in France for at least 5 years since 11	French nationality is acquired by descent under one of the following conditions: Through parentage (right of blood): The child (legitimate or natural) is French if at least one parent is French.	4 years' marriage; also, after 5 years outside France	Holders of a French permanent residence permit for at least 5 years' residence No residence (former citizens with conditions)	是
Germany		Persons born in Germany, if at least one parent has resided in Germany for at least 8 years and holds a permanent residence permit	German nationality is acquired by descent under one of the following conditions: Through parentage (right of blood) Member of recognized historical German community abroad (e.g. in the Balkans, Kazakhstan); Also granted to children/grandchildren of those deprived of citizenship by the Nuremberg Laws	2 years of marriage and 3 years of continuous residence in Germany	8 years' residence 7 years' residence (if an integration course has been completed) 6 years' residence (if especially well integrated and has a very high command of the German language, or a refugee or stateless person) No residence (victims of Nazi persecution)	No, unless: Conditions the non-German citizenship is obtained by birth (binational parents [one German, one foreign] or birth in a jus-soli country such as USA and Canada) the non-German citizenship is of an EU country or Switzerland and obtained by naturalisation the non-German citizenship is obtained by naturalisation and permission has been granted by the German authorities German citizenship is obtained by naturalisation by a refugee German citizenship is obtained by naturalisation and permission has been granted by the German authorities to keep the non-German citizenship under § 12 StAG born in Germany to at least one legal permanent resident and grown up there. The foreign parents born and grown up abroad cannot have dual citizenship themselves.
Greece		Persons born in Greece who: have a parent born in Greece are foundlings are stateless	Greek nationality is acquired by descent under one of the following conditions: Member of recognized historical Greek community abroad in countries of ex-USSR Ethnic Greek of different citizenship accepted to military academies, or inscribes to serve to the army, or enlists as a volunteer in time of war	3 years of continuous residence in Greece and has an offspring from the marriage	10 years residence in the last 12 years 5 years residence in the last 12 years for refugees Sufficient knowledge of Greek language, Greek history, and Greek culture in general Athlete of an Olympic Sport, with 5 years residence in the last 12 years, who fulfills the conditions of being a member of the Greek National Team of that sport, as these are stated by the international laws for that sport	是
Hungary		Persons born in Hungary who: are foundlings are stateless	Hungarian nationality is acquired by descent under one of the following conditions: At least one parent is a Hungarian citizen Any person of Hungarian ethnicity, which has to be proven by sufficient level of Hungarian language demonstrating at least one ancestor born in the Kingdom of Hungary (no limit on number of generations).	是 After 3 years	After 8 years and meeting conditions of good character After 5 years if born in Hungary resided in Hungary in their pupillage stateless After 3 years if married to a Hungarian citizen has a minor child that is Hungarian citizen adopted by a Hungarian citizen refugee in Hungary	是
Ireland		Persons born in Ireland: are automatically an Irish citizen if he or she is not entitled to the citizenship of any other country. entitled to be an Irish citizen if at least one parent is: an Irish citizen (or someone entitled to be an Irish citizen). a resident of the island of Ireland who is entitled to reside in either the Republic or in Northern Ireland without any time limit on that residence. a legal resident of the island of Ireland for three out of the 4 years preceding the child's birth.	Irish nationality is acquired by descent under one of the following conditions: if at the time of birth, at least one parent was an Irish citizen. if you have an Irish citizen grandparent born on the island of Ireland. The parent would have automatically been an Irish citizen. Grandchild can secure citizenship by registering themselves in the Foreign Births Register. Citizenship gained via the Foreign Births Register can only be passed on to children born after the parent themselves were registered.	3 years of marriage or civil partnership to an Irish citizen	5 years of residency in Ireland, of which 1 (one) year immediately before application	是
Italy		Persons born in Italy who: have a parent born in Italy are foundlings are stateless	Italian nationality is acquired by descent under one of the following conditions: Conditions (Rules are in place that permit the recognition of Italian nationality for many members of the Italian diaspora, even generations after departure. The rules are complex.) Citizenship was accorded ethnic Italians born in the territory only in/after 1863. After this, Italian citizen fathers could pass down citizenship. Mothers pass down citizenship only for children born in/after 1948. A child gaining another citizenship by birth may also gain Italian citizenship by parentage, with no interference. If such a child is an Italian citizen, he/she can pass on citizenship subject to the rules above, like any other Italian citizen. A person naturalizing to a foreign state loses the right to pass on citizenship to any children he/she may have after naturalization. A father's later naturalization also retroactively annulled the child's citizenship if the child was born before 1910.	2 years of legal residence in Italy (3 years if living abroad) through naturalisation	10 years' residence, no criminal record and sufficient financial resources 7 years' residence for children adopted by Italian citizens 5 years' residence for refugees or stateless individuals 4 years' residence for EU member states nationals 3 years' residence for descendants of Italian grandparents and for foreigners born in Italy	是
Latvia		Persons born in Latvia who:	Latvian nationality is acquired by descent under one of the following conditions:		After 5 years of permanent residence	Starting from October the 1st, 2013 hereby listed persons are eligible to have dual citizenship with Latvia: citizens of member countries of EU, NATO and EFTA (Iceland, Liechtenstein, Norway, Switzerland) citizens of Australia, Venezuela, Brazil, New Zealand citizens of the counties that have had mutual recognition of dual citizenship with Latvia people who were granted the dual citizenship by the Cabinet of Ministers of Latvia people of Latvian or Livonian ethnicity or exiles registering citizenship of Latvia people who have applied for dual citizenship before the previous Latvian Citizenship law (1995).
Lithuania		Persons born in Lithuania who: are stateless.	Lithuanian nationality is acquired by descent under one of the following conditions: at least one parent is a Lithuanian citizen at least one direct ancestor was Lithuanian citizen during the period of 1918-1940.	7 years of permanent residence and demonstrating Lithuanian language ability		否
Luxembourg		Persons born in Luxembourg who: are stateless, or are foundlings, or have a parent born in Luxembourg		否	7 consecutive years' residence	是
Malta		Persons born in Malta between 21 September 1964 and 31 July 1989 Persons born outside Malta between 21 September 1964 and 31 July 1989 to a father with Maltese citizenship through birth in Malta, registration or naturalisation Persons born on or after 1 August 1989, inside or outside Malta, to at least one parent with Maltese citizenship through birth in Malta, registration or naturalisation	Maltese nationality is acquired by descent under one of the following conditions:	是 5 years of marriage to a Maltese citizen (if de jure or de facto separated, then still living together five years after the marriage) or a widow/widower of a Maltese citizen five years after the marriage	5 years of residence	是
Netherlands		Persons born in Netherlands who: see: "Dutch by birth"	Dutch nationality is acquired by descent under one of the following conditions: Persons with a Dutch parent	3 years of residence and demonstrating Dutch language ability	After 5 years uninterrupted residence, with continuous registration in the municipal register	Under certain conditions: e.g. foreign citizenship may be kept in the event of naturalization via marriage.
Poland		Persons born in Poland.	Polish nationality is acquired by descent under one of the following conditions: Conditions Certain descendants of Polish citizens, even after multiple generations, can apply for recognition: Polish citizenship begins 1920. Acquisition of foreign citizenship prior to 1951 led to the loss of Polish nationality. After this, any Polish citizen transmits nationality to all his/her children and nationality is only lost by explicit request. These children can pass on nationality as well. Descendants of Polish-language/ethnic persons in some neighboring countries including Belarus, Lithuania, Russia, Kazakhstan, Ukraine et al., can apply for Karta Polaka which gives many of the same rights as Polish citizenship but serves as a substitute when acquisition of Polish citizenship would result in the loss of the person's earlier citizenship.	是	3 years of residence with permanent residence permit card under the condition of speaking Polish language 2 years of residence with permanent residence permit card under the condition of having Polish ethnicity	Yes but in Poland, Polish identification must be used and the dual citizen is treated legally as only Polish
Portugal		Persons born in Portugal who: are stateless are foundlings have a birth parent resident in Portugal for at least 10 years on a valid residence permit have a birth parent with citizenship of a Lusophone country and resident in Portugal for at least 6 years on a valid residence permit	Portuguese nationality is transmitted by descent under one of the following conditions: Conditions a child becomes a Portuguese national at birth, and nationality is recognized by the law itself if at least one of the parents of that child is a Portuguese national and the birth takes place in Portugal or in a territory administered by Portugal. (That form of transmission of nationality, combining descent from a Portuguese parent and birth in Portugal is the main form of transmission of the Portuguese nationality). No registration is necessary for the transmission of nationality in that case. Nationality is also recognized by the law itself at birth to a child born outside Portugal, provided that the said child has at least one Portuguese parent, and the birth takes place outside Portugal due to the parent's service to the Portuguese State abroad. No registration is necessary for the transmission of nationality in that case, Nationality retroactive to the moment of birth is recognized by the law to a person born outside Portugal if at least one of the birth parents is a Portuguese national, but only if that person's birth is registered before the Portuguese Civil Registry or if a declaration by that person, stating that he or she wants to be a Portuguese citizen, is lodged with the Portuguese Civil Registry. The registration of the birth can be applied for at any time during the person's life, by the parents, by another legal guardian of a minor, or by the person himself, if the person is already of age (18 years old or older). The registration of the birth or of the declaration can be made at any time during the person's life, but the descendants of that person cannot ask for the registration after that person is dead. Thus, if one generation is skipped, the next generation cannot register. Registration can be made either in Portugal or by means of a Portuguese Consulate abroad. If the registration is applied to by means of a Consulate, the Consulate processes the request and sends the necessary papers to the central registry office of the Portuguese Civil Registry in Lisbon. Given that the registration produces legal effects retroactive to the moment of birth, the person, once registered as a Portuguese citizen, is recognized by law as a natural born citizen.(Sons and daughters of that person, even if born before the moment of that person's registration, and even if born outside Portugal are therefore themselves able to apply for registration as Portuguese citizens, because their parent is a Portuguese citizen since birth. Accordingly, this form of transmission of nationality, combining descent and registration, allows for the transmission of Portuguese nationality from generation to generation indefinitely, even if the members of the successive generations are born outside Portugal and never reside in Portugal, provided that registration is not skipped by one generation). Many descendants of Portuguese immigrants, especially in Brazil and other Lusophone countries, hold dual nationality, being recognized as natural born Portuguese citizens upon registration under that rule.	A person married to a Portuguese national for at least 3 years can apply to be registered as a Portuguese national as a matter of right, provided that the registration is applied for during the marriage (and not after its dissolution by death or divorce). Nationality takes effect upon registration and is not retroactive, and is not lost by the dissolution of the marriage.	Naturalisation conditions Naturalization can be granted at the State's discretion to persons who are of age and who reside in Portugal for at least six years on a valid permit, provided that they demonstrate knowledge of the Portuguese language and have never been convicted of a crime punishable under Portuguese law with a prison term of 3 years or more. Naturalization can be granted to persons who do not reside in Portugal, or who do not satisfy the condition of residing in Portugal for at least six years on a valid permit, provided that the person applying is a second degree relative (grandson or granddaughter, or a sibling) of a Portuguese citizen. the Portuguese Government can also grant naturalization to foreigners who are of age and who meet neither the six-year legal residency requirement nor the knowledge of the Portuguese language requirement, provided that the person was a Portuguese national in the past, or that the applicant is held to be a descendant of Portuguese citizens, or a member of Portuguese communities abroad, or provided that the applicant is found to have rendered, or is expected to render in the future relevant services to the Portuguese State or to the national community. Minors born in Portugal to foreign parents can by be granted Portuguese Nationality by the Government, if, at the time of the request made on their behalf by their legal representatives, they have completed the first cycle of the basic education in Portugal, and if one of the parents legally resides in Portugal for at least five years. The requirements of being of age at the time of the request and of legally residing in Portugal for at least six years are waived with respect to a minor meeting those conditions, but the minor must still demonstrate sufficient knowledge of the Portuguese language, and must not have been convicted to crimes that carry under Portuguese law a prison penalty of thee years or more. the Portuguese Government can also grant naturalization to foreigners who prove that they descend from Portuguese Sephardic Jews and who demonstrate that they belong to a traditional Jewish Sephardic community of Portuguese origin; Nationality is granted as a matter of right (and not by naturalization in the strict sense) to a person who is a son or a daughter of someone who acquires Portuguese Nationality by naturalization, provided that the person was a minor at the time of the parent's naturalization, and provided that the person in question, either represented by his parents or by another legal guardian (during minority or incapacity), or by himself (once of age) applies to be registered as a Portuguese national.	是
Romania		Persons born in Romania who: are foundlings have Romanian parents	Romanian nationality is acquired by descent under one of the following conditions: Conditions Persons with a Romanian ancestor up to 3 generations back may be eligible for citizenship: Persons with at least one parent, grandparent or great-grandparent, born anytime before 1940 in a location that was in the Kingdom of Romania between 1918 and 1940 (including Bessarabia and Northern Bukovina) and can demonstrate competence in the Romanian language, are eligible for restoration of citizenship. Persons with a parent or grandparent still registered as a Romanian citizen, may apply for clarification of their own citizenship. Romanian citizenship is NOT automatically lost by naturalization to a foreign country.	5 years' residence in Romania	8 years' residence 4 years' residence (EU citizens)	是
Slovakia		Persons born in Slovakia who:	Slovak nationality is acquired by descent under one of the following conditions:	After 5 years' residence in Slovakia, and living in Slovakia without any immigration restrictions at the time of application	8 years' residence (5 years until a permanent residence is acquired plus 3 years of permanent residence)	Dual citizenship is permitted to Slovak citizens who acquire a second citizenship by birth or through marriage; and to foreign nationals who apply for Slovak citizenship and meet the requirements of the Citizenship Act.
Slovenia		A child born in Slovenia is a Slovenian citizen if either parent is a Slovenian citizen. Where the child is born outside Slovenia the child will be automatically Slovenian if: both parents are Slovenian citizens; or one parent is Slovenian and the other parent is unknown, is of unknown citizenship or is stateless. A person born outside Slovenia with one Slovenian parent who is not Slovenian automatically may acquire Slovenian citizenship through: an application for registration as a Slovenian citizen made at any time before age 36; or taking up permanent residence in Slovenia before age 18. Children adopted by Slovenian citizens may be granted Slovenian citizenship.	Slovenian nationality is acquired by descent under one of the following conditions: A person of "Slovenian origin" up to the fourth generation in direct descent or a former Slovenian citizen may be naturalised without any residence requirements.	A person who is married to a Slovenian citizen for at least two years may be naturalised after one year's residence in Slovenia	A total of 10 years residence in Slovenia, including 5 years continuous residence before the application	Dual citizenship is generally permitted in Slovenia, except for certain persons seeking to become Slovenian citizens by naturalisation they are to renounce any foreign citizenship (the requirement to renounce foreign citizenship may be waived upon special application).
Spain		Persons born in Spain who: are stateless, or are foundlings	Children of Spanish citizens	1 year of marriage to a Spanish citizen and residence in Spain	10 years' residence 5 years' residence (refugees) 2 years' residence (for nationals of Iberoamerica, Andorra, Philippines, Equatorial Guinea, Portugal, or if the individual is a Sephardi Jew) 1 year's residence (persons born in Spain)	Yes (if a Spanish citizen by descent/origin); if naturalising in an Iberoamerican country, Spanish—and EU citizenship—is "dormant" until the return to Spain; see Multiple citizenship. No (if a naturalised Spanish citizen, unless from Iberoamerica, Andorra, Philippines, Equatorial Guinea or Portugal)
Sweden		Persons born in Sweden who: are stateless, or are foundlings (canceled if parents found)	Swedish nationality is acquired by descent under one of the following conditions: Conditions Person: whose mother is a Swedish citizen, or born in Sweden whose father is a Swedish citizen whose father is a Swedish citizen and married to the mother (also later marriage)	3 years' marriage in case residing in Sweden, 10 years in case living abroad with a Swedish spouse and has 'strong ties' to Sweden, by family visits and such	5 years normal residence permit(not the time limited residence/work permit/Study Permit) and must hold Swedish permanent residence permit at the time of applying or person with a visa intended for settlement in Sweden with 5 years residence in Sweden. 2 years if citizen of a Nordic country (i.e. Denmark, Finland, Iceland and Norway)	是
United Kingdom		Persons born in United Kingdom who: see: "British by birth"	British nationality is acquired by descent under one of the following conditions: see: "British by descent"	6 years' residence (must be without any immigration restrictions on date of application)	6 years' residence (the last year of which without any immigration restrictions)	是

Danish opt-out

更多信息：Opt-outs in the European Union

Denmark obtained four opt-outs from the Maastricht Treaty following the treaty's initial rejection in a 1992 referendum. The opt-outs are outlined in the Edinburgh Agreement and concern the EMU (as above), the Common Security and Defence Policy (CSDP), Justice and Home Affairs (JHA) and the citizenship of the European Union. The citizenship opt-out stated that European citizenship did not replace national citizenship; this opt-out was rendered meaningless when the Amsterdam Treaty adopted the same wording for all members. The policy of recent Danish governments has been to hold referenda to abolish these opt outs, including formally abolishing the citizenship opt out which is still technically active even if redundant.

See also

• Visa requirements for the European Union citizens
• Passport of the European Union
• National identity cards in the European Union
• European Citizens' Initiative
• European citizens' consultations
• Spatial Citizenship
• Europe for Citizens
• Four Freedoms (European Union)
• Naturalization

Further reading

• Maas, Willem. Creating European Citizens. Lanham: Rowman & Littlefield. 2007. ISBN 978-0-7425-5485-6. 
• Meehan, Elizabeth. Citizenship and the European Community. London: Sage. 1993. ISBN 978-0-8039-8429-5. 
• O'Leary, Síofra. The Evolving Concept of Community Citizenshippublisher=Kluwer Law International. The Hague. 1996. ISBN 978-90-411-0878-4. 
• Soysal, Yasemin. Limits of Citizenship. Migrants and Postnational Membership in Europe. University of Chicago Press. 1994. 
• Wiener, Antje. 'European' Citizenship Practice: Building Institutions of a Non-State. Boulder: Westview Press. 1998. ISBN 0-8133-3689-9. 
• European Commission. Right of Union citizens and their family members to move and reside freely within the territory of the Member States. 

External links

• EU Citizenship, European Commission Directorate-General for Justice
• EUDO Citizenship Observatory