The Constitution of India is the supreme law of India. The document lays down the framework that demarcates fundamental political code, structure, procedures, powers, and duties of government institutions and sets out fundamental rights, directive principles, and the duties of citizens, based on the proposal suggested by M. N. Roy. It is the longest written national constitution in the world.

The legal system of India consists of civil law, common law, customary law, religious law and corporate law within the legal framework inherited from the colonial era and various legislation first introduced by the British are still in effect in modified forms today. Since the drafting of the Indian Constitution, Indian laws also adhere to the United Nations guidelines on human rights law and the environmental law. personal law is fairly complex, with each religion adhering to its own specific laws. In most states, registering of marriages and divorces is not compulsory. Separate laws govern Hindus including Sikhs, Jains and Buddhist, Muslims, Christians, and followers of other religions. The exception to this rule is in the state of Goa, where a uniform civil code is in place, in which all religions have a common law regarding marriages, divorces, and adoption. Plus, recently, on February 7, 2024, the Indian state of Uttarakhand has also incorporated a uniform civil code. In the first major reformist judgment for the 2010s, the Supreme Court of India banned the Islamic practice of "Triple Talaq". The landmark Supreme Court of India judgment was welcomed by women's rights activists across India.