15 elections on record · CPI(M) dominant · 15 total
Orathanadu is an Assembly constituency in Tamil Nadu. It has participated in 15 elections from 1962 to 2026. CPI(M) is the historically dominant party with 5 wins out of 15 elections.
| Year | Winner | Party | Votes | Vote % | Runner-up | Party | Margin |
|---|---|---|---|---|---|---|---|
| 2026 | R. Vaithilingam | DMK | 86759 | 44.42% | Dr. K. Arvind | TVK | 35028 |
| 2021 | R. Vaithilingam | ADMK | 90063 | 46.95% | M. Ramachandran | DMK | 28835 |
| 2016 | Ramchandran M | DMK | 84378 | 46.87% | Vaithilingam R | ADMK | 3645 |
| 2011 | R. Vaithilingam | AIADMK | 91724 | 57.8% | Mahendran K. S | PMK | 32644 |
| 2006 | V. Marimuthu | CPI(M) | 57315 | 45.83% | K. A. Jayapal | ADMK | 2344 |
| 2001 | R. Jeevanantham | AIADMK | 59808 | 53.55% | S.P. Thangaiya | DMK | 16717 |
| 1996 | G. Nizamudeen | DMK | 46533 | 43.68% | R. Jeevanantham | ADMK | 19728 |
| 1991 | R. Kodimari | ADMK | 53050 | 52.20% | G. Veerajyan | CPI(M) | 9934 |
| 1989 | G. Veeraiyan | CPI(M) | 44681 | 44.70% | Pon Palanivelu | INC | 13797 |
| 1984 | G. Veeraiyan | CPI(M) | 43684 | 48.24% | S. Thenkovan | AIADMK | 4986 |
| 1980 | R. Umanath | CPI(M) | 44105 | 51.38% | Ramanatha Thevar. S. S. R. | INC | 2367 |
| 1977 | R. Umanath | CPI(M) | 31519 | 39.65% | A. Ambalavanan | DMK | 710 |
| 1971 | Vadivel S. | CPI | 31977 | 53.25% | K. B. S. Mani | INC | 6310 |
| 1967 | K. B. S. Mani | Independent | 34316 | 58.23% | R. Thangavelu | INC | 12814 |
| 1962 | C. Srinivasa Iyengar | INC | 33301 | 44.78% | S. P. Thangavelan | DMK | 10862 |