| Tõnu Õim | |
| Country: | Soviet Union Estonia |
| Birth Date: | 16 June 1941 |
| Birth Place: | Raasiku, Estonia |
| Iccfworldchampion: | 1977–1983 1994–1999 |
| Rating: | 2330 (July 2023) |
| Peakrating: | 2410 (July 1994) |
| Iccf Rating: | 2581 (April 2005) |
| Iccf Peakrating: | 2617 (April 2000) |
Tõnu Õim (born 16 June 1941)[1] is an Estonian grandmaster of correspondence chess, most famous for being the first to have won the ICCF World Championship twice, in 1983 and 1999.[2] In 1991 he won the Axelson Memorial.[3] In play, he was awarded the Soviet Master title in 1966.[4] He does not hold a FIDE title for over-the-board play; however, his peak FIDE rating of 2410 indicates a player of International Master strength.[5]