| Noc: | THA |
| Nocname: | National Olympic Committee of Thailand |
| Year: | 2009 |
| Games: | Southeast Asian Games |
| Location: | Vientiane |
| Flagbearer: | Kawin Thamsatchanan (football) |
| Gold: | 86 |
| Silver: | 83 |
| Bronze: | 97 |
| Rank: | 1 |
| Appearances: | |
| Website: |
Thailand participated in the 2009 Southeast Asian Games in the city of Vientiane, Laos from 9 December 2009 to 18 December 2009.
General Yuthasak Sasiprapha, the president of the National Olympic Committee of Thailand, told local media that Thailand expected to win about 100 gold medals.[1]
Two years ago, then-hosts Thailand dominated the medals standings with 183 gold out of a total of 477 - well ahead of second-placed Malaysia on 68 and Vietnam on 64.[2]