# 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

| Date | Event | ADMK | DMK | INC | IUML | Independent | Vacant | Total |
| 19 May 2016 | 2016 Tamil Nadu Legislative Assembly election (Election to Aravakurichi and Thanjavur were cancelled by the EC on confirmed reports of bribing voters) | 134 | 89 | 8 | 1 | 0 | 2 | 232 |
| 25 May 2016 | Tirupparankundram AIADMK MLA S M Seenivel passes away | 133 | 89 | 8 | 1 | 0 | 3 | 231 |
| 22 November 2016 | First By-Election (19 November 2016) | 136 | 89 | 8 | 1 | 0 | 0 | 234 |
| 6 December 2016 | RK Nagar AIADMK MLA, Tamil Nadu CM J. Jayalalithaa Passes Away | 135 | 89 | 8 | 1 | 0 | 1 | 233 |
| 18 September 2017 | Disqualification of 18 dissident AIADMK MLAs | 117 | 89 | 8 | 1 | 0 | 19 | 215 |
| 24 December 2017 | Second By-Election (21 December 2017) | 117 | 89 | 8 | 1 | 1 | 18 | 216 |
| 2 August 2018 | Tirupparankundram AIADMK MLA A.K. Bose passes away | 116 | 89 | 8 | 1 | 1 | 19 | 215 |
| 7 August 2018 | Tiruvarur DMK MLA, Former CM of Tamil Nadu CM M Karunanidhi Passes Away | 116 | 88 | 8 | 1 | 1 | 20 | 214 |
| 20 February 2019 | Hosur AIADMK MLA P. Balakrishna Reddy convicted by special court | 115 | 88 | 8 | 1 | 1 | 21 | 213 |
| 21 March 2019 | Sulur AIADMK MLA R Kanagaraj passes away | 114 | 88 | 8 | 1 | 1 | 22 | 212 |
| 23 May 2019 | Third By-Election (18 April 2019) | 123 | 101 | 8 | 1 | 1 | 0 | 234 |
| 29 May 2019 | Nanguneri, Congress MLA Vasanthakumar resigned after being elected to Lok Sabha | 123 | 101 | 7 | 1 | 1 | 1 | 233 |
| 14 June 2019 | Vikravandi DMK MLA K Radhamani passes away | 123 | 100 | 7 | 1 | 1 | 2 | 232 |
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:
| Constituency | Contestant DMK | Contestant ADMK | Winning candidate | Winning party | Margin |
| Aravakurichi | K. C. Palanisamy | V. Senthil Balaji | V. Senthil Balaji | AIADMK | 23,661 |
| Thanjavur | Anjugam Boopathy | M. Rangaswamy | M. Rangaswamy | AIADMK | 26,874 |
| Thiruparankundram | Saravanan | A. K. Bose | A. K. Bose | AIADMK | 42,670 |

### Aravakuruchi

2016 Tamil Nadu Legislative Assembly election: Aravakurichi :
| Party | Party | Candidate | Votes | % | ±% |
| | AIADMK | V. Senthil Balaji | 88,068 | 53.51 | |
| | DMK | K. C. Palanisamy | 64,407 | 39.13 | |
| | BJP | S. Prabhu | 3,162 | 1.92 | New |
| | NOTA | None of the above | 1,538 | 0.93 | |
| | DMDK | M. Muthu | 1,513 | 0.92 | New |
| Majority | Majority | Majority | 23,661 | 14.38 | |
| Turnout | Turnout | Turnout | 1,64,582 | 82.15 | |
| | AIADMK gain from DMK | AIADMK gain from DMK | Swing | | |

### Tanjore

2016 Tamil Nadu Legislative Assembly election: Thanjavur :
| Party | Party | Candidate | Votes | % |
| | AIADMK | M. Rangaswamy | 1,01,362 | 54.37 |
| | DMK | Anjugam Boopathy | 74,488 | 39.95 |
| | BJP | Ramalingam M S | 3,806 | 2.04 |
| | NOTA | None of the above | 2,295 | 1.23 |
| | DMDK | Abdullah Sait V | 1,534 | 0.82 |
| Majority | Majority | Majority | 26,874 | 14.41 |
| Turnout | Turnout | Turnout | 1,86,444 | 69.37 |
| | AIADMK hold | AIADMK hold | Swing | |

### Thirupparakundram

2016 Tamil Nadu Legislative Assembly bye-election: Thiruparankundram :
| Party | Party | Candidate | Votes | % | ±% |
| | AIADMK | A. K. Bose | 113,032 | 55.65 | 8.33 |
| | DMK | P. Saravanan | 70,362 | 36.73 | 1.05 |
| | NOTA | None of the Above | 2,214 | 1.10 | 0.48 |
| Majority | Majority | Majority | 42,670 | 18.92 | 7.28 |
| Turnout | Turnout | Turnout | 203,100 | 70.89 | 0.26 |
| | AIADMK hold | AIADMK hold | Swing | 8.33 | |

## 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.
2017 Tamil Nadu Legislative Assembly By-election: Dr. Radhakrishnan Nagar :
| Party | Party | Candidate | Votes | % | ±% |
| | Independent | T. T. V. Dhinakaran | 89,013 | 50.32 | N/A |
| | AIADMK | E. Madhusudhnan | 48,306 | 27.31 | −28.56 |
| | DMK | N. Marudhu Ganesh | 24,651 | 13.94 | −19.2 |
| | NTK | Kalaikottuthayam | 3,802 | 2.15 | N/A |
| | None of the Above | NOTA | 2,373 | 1.34 | −0.31 |
| Margin of victory | Margin of victory | Margin of victory | 40,707 | 23.01 | +0.28 |
| Turnout | Turnout | Turnout | 1,76,890 | 77.68 | +9.32 |
| | Independent gain from AIADMK | Independent gain from AIADMK | Swing | | |