The Tamil Nadu Legislative Assembly is the unicameral legislature of the Indian state of Tamil Nadu. It has a strength of 234 members, all of whom are democratically elected using the first-past-the-post system. The presiding officer of the Assembly is the Speaker. The term of the Assembly is five years, unless dissolved earlier.

Madras State was a state of India which was in existence during the mid-20th century. The state came into existence on 26 January 1950 when the Constitution of India was adopted and included the present-day Tamil Nadu, Kerala and parts of neighboring states of Andhra Pradesh and Karnataka. Andhra state was separated in 1953 and the state was further re-organized when states were redrawn linguistically in 1956. On 14 January 1969, the state was renamed as Tamil Nadu.