Every person born in India on or after 26.01.1950 but before 01.07.1987 is an Indian citizen irrespective of the nationality of his/her parents.
Every person born in India between 01.07.1987 and 02.12.2004 is a citizen of India given that either of his/her parents is a citizen of the country at the time of his/her birth.
Every person born in India on or after 3.12.2004 is a citizen of the country given both his/her parents are Indians or at least one parent is a citizen and the other is not an illegal migrant at the time of birth.
By Registration
A person of Indian origin who has been a resident of India for 7 years before applying for registration.
A person of Indian origin who is a resident of any country outside undivided India.
A person who is married to an Indian citizen and is ordinarily resident for 7 years before applying for registration.
Minor children of persons who are citizens of India.
By Descent
A person born outside India on or after January 26, 1950 is a citizen of India by descent if his/her father was a citizen of India by birth.
A person born outside India on or after December 10, 1992, but before December 3, 2004 if either of his/her parents was a citizen of India by birth.
If a person born outside India or or after December 3, 2004 has to acquire citizenship, his/her parents have to declare that the minor does not hold a passport of another country and his/her birth is registered at an Indian consulate within one year of birth.
By Naturalisation
A person can acquire citizenship by naturalisation if he/she is ordinarily resident of India for 12 years and fulfils all qualifications in the third schedule of the Citizenship Act.
By Incorporation of Territory
If any foreign territory becomes a part of India, the Government of India specifies the persons who among the people of the territory shall be the citizens of India.