| Election Name: | Tamil Nadu assembly by-election, 1997/98 |
| Country: | India |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | Tamil Nadu assembly by-election, 1952-95 |
| Previous Year: | 1952-95 |
| Next Election: | Tamil Nadu assembly by-election, 1999/2000 |
| Next Year: | 1999/2000 |
| Election Date: | 8 February 1997 and 22 February 1998 |
| Seats For Election: | 3 vacant seats in the Legislature of Tamil Nadu |
| Leader1: | M. Karunanidhi |
| Party1: | Dravida Munnetra Kazhagam |
| Alliance1: | United Front |
| Leaders Seat1: | Chepauk |
| Seats1: | 3 |
| Seat Change1: | - |
| Popular Vote1: | 145,842 |
| Percentage1: | 41.2% |
| Leader2: | J. Jayalalithaa |
| Leaders Seat2: | None |
| Party2: | All India Anna Dravida Munnetra Kazhagam |
| Alliance2: | ADMK alliance |
| Seats2: | 0 |
| Seat Change2: | - |
| Popular Vote2: | 121,962 |
| Percentage2: | 34.4% |
| Chief Minister | |
| Posttitle: | Chief Minister |
| Before Election: | M. Karunanidhi |
| Before Party: | Dravida Munnetra Kazhagam |
| After Election: | M. Karunanidhi |
| After Party: | Dravida Munnetra Kazhagam |
By-elections to Pudukottai constituency was held in Tamil Nadu on 8 February 1997. Elections for two state assembly constituencies, Coonoor and Aruppukottai were held on 22 February 1998.
The results were a sweep for the DMK. However, all three seats were held by DMK from the 1996 election, and there was a significant improvement by the AIADMK, losing by very small margins in all three constituencies.
Source: Election Commission of India[1] [2]