ALL INDIAN MARRIAGES HAVE TO BE REGISTERED. In 2013, the Indian Parliament amended the law that made registration of Indian marriages compulsory, regardless of religion, caste or location in India.
India has 5 marriage laws [Hindu Marriage Act, 1955, Indian Christian Marriage Act 1889, Muslim Marriage Acts, Parsi Marriage and Divorce Act, 1936, Special Marriage Act, 1954]. Until mid-2013, marriage registration was compulsory for only weddings under the Hindu, Parsi and Special Marriage Acts. “Registration of Births and Deaths Act, 1969” was amended to make registration of marriage compulsory along with birth and death.
Except for marriages under the “Special Marriage Act, 1954”, all registration of marriage in India is only done after a religious wedding ceremony has been performed. In the case of India’s Special Marriage Act (1954), the registration of marriage is also the solemnization of the marriage. [This link has the rules for marriages under Special Marriage Act, 1954]
In terms of legislation in India, marriage and divorce are part of the “Concurrent List”. This means that although uniformity on laws for marriage and divorce throughout India are desirable, it is not essential.
Thus Indian states have different laws for marriage and divorce. Marriage registration process varies from state to state; but the differences are minor.