The All India Anna Dravida Munnetra Kazhagam is an Indian regional political party with great influence in the state of Tamil Nadu and the union territory of Puducherry. It is a Dravidian party founded by the former chief minister of Tamil Nadu M. G. Ramachandran (M.G.R.) at Madurai on 17 October 1972 as a breakaway faction from the Dravida Munnetra Kazhagam after M. Karunanidhi expelled him from the party for demanding an account as the party treasurer. The party is adhering to the policy of socialism and secularism based on the principles of C. N. Annadurai (Anna) collectively coined as Annaism by M.G.R. The party has won a seven-time majority in the Tamil Nadu Legislative Assembly and has emerged as the most successful political outfit in the state's history. It is currently the main opposition party in the Tamil Nadu Legislative Assembly.

Conjeevaram Natarajan Annadurai, popularly known as Anna, also known as Perarignar Anna, was an Indian politician who served as the fourth and last Chief Minister of Madras State from 1967 until 1969 and first Chief Minister of Tamil Nadu for 20 days before his death. He was the first member of a Dravidian party to hold either post.