2016–2017 Tamil Nadu Legislative Assembly by-elections

During the 2016–2017 timeframe, by-elections were held in Tamil Nadu, India, due to the following events:


 * 25 May 2016 - Tirupparankundram AIADMK MLA S M Seenivel died
 * 5 December 2016 - Radhakrishnan Nagar AIADMK MLA and CM of Tamil Nadu J. Jayalalithaa died

Events leading to By-Election
The 123 AIADMK members include three independents who contested under the AIADMK symbol. They are M.Thamimun Ansari from Nagapattinam (Manithaneya Jananayaga Katchi), U. Thaniyarasu from Kangayam (Tamil Nadu Kongu Ilaingar Peravai) and Karunas from Tiruvadanai (Mukkulathor Pulipadai).

November 2018 by-elections
On 26 October 2016, the Election Commission announced that the election for Thiruparankundram, Aravakurichi and Thanjavur constituencies would be held on 19 November 2016. The outcome was:

December 2017 by-elections
On 24 November 2017, the Election Commission announced that the election for Radhakrishnan Nagar constituency would be held on 21 December 2017.