The Fifteenth Legislative Assembly Election was held on 16 May 2016 for the 232 seats of the Legislative Assembly in the state of Tamil Nadu in India. The AIADMK under J. Jayalalithaa won the elections and became the first ruling party to be re-elected in Tamil Nadu since 1984, though with a simple majority. The DMK won half of the seats it contested but its allies performed poorly; notably, the Indian National Congress won 16% of the seats they contested, and the alliance lost due to its poor performance. The votes were counted on 19 May 2016. In the previous election in 2011, AIADMK, under the leadership of Jayalalithaa, won a thumping majority and formed the government, while DMDK chief Vijayakanth served as the Leader of Opposition until January 2016. This was the last election that J. Jayalalithaa and M. Karunanidhi contested, as they both died later that year and 2018 respectively.

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.