The Constitution of India does not allow dual citizenship (simultaneously holding Indian citizenship and citizenship of a foreign country. However, the government has granted Overseas Citizenship of India (OCI) to certain categories of persons. The Citizenship Act 1955 provides that the Central Government may, subject to certain conditions and on an application made in this behalf, register any person of the following categories as an overseas citizen of India:
person of Indian origin of full age and capacity who is a citizen of a specified country;
person of full age and capacity who has obtained the citizenship of a specified country on or after the commencement of the Citizenship (Amendment) Act, 2003 and who was a citizen of India immediately before such commencement;
and such person who is a minor of a person mentioned in clause (a) or clause (b).
The person registered as an overseas citizen of India shall be an overseas citizen of India as from the date on which he is so registered. No person who has been deprived of his Indian citizenship under this Act shall be registered as an overseas citizen of India except by an order of the Central Government.
The expression "person of Indian origin" shall mean a citizen of another country who-
was eligible to become a citizen of India at the time of the commencement of the Constitution;
belonged to a territory that became part of India after the 15th day of August, 1947; and
the children and grand-children of a person belonging to the above mentioned categories but does not include a person who is or had been at any time a citizen of Pakistan, Bangladesh or such other country as the Central Government may, by notification in the Official Gazette, specify.
An overseas citizen of India shall not be entitled to the rights conferred on a citizen of India-
under the provisions of the Constitution with regard to equality of opportunity in matters of public employment;
under the provisions of the Constitution for election as President;
under the provisions of the Constitution for election of Vice-President;
under the provisions of the Constitution for appointment as a Judge of the Supreme Court;
under the provisions of the Constitution for appointment as a Judge of the High Court;
under the provisions of the Representation of the People Act, 1950 in regard to registration as a voter;
under the provisions of the Representation of the People Act, 1951 with regard to the eligibility for being a member of the House of the People or of the Council of States, as the case may be.
under the provisions of the Representation of the People Act, 1951 with regard to the eligibility for being a member of the Legislative Assembly or a Legislative Council, as the case may be, of a State;
for appointment to public services and posts in connection with the affairs of the Union or of any State except for appointment in such services and posts as the Central Government may by special order in that behalf specify.