2016 Thailand National Triathlon Championships was held in Rayong on January 31st. 76 athletes from more than 12 countries took part in the championships with two distances; Sprint and Standard distance. Thailand have two national Champions: Supakit Sukatipum (Male, 17yrs) Sanrutha Arunsiri (Female, 20yrs)
Junior Men
| Rank | Name | Swim | Bike | Run | Total |
| 1 | Amin SayHaie Dehhordi | 0:13:17 | 0:31:36 | 0:19:18 | 1:04:11 |
| 2 | Supakit Sukatipum | 0:13:18 | 0:31:35 | 0:19:41 | 1:04:34 |
| 3 | Kritsanaphon Phonphai | 12:14 | 0:32:38 | 0:19:56 | 1:04:48 |
Junior Women
| Rank | Name | Swim | Bike | Run | Total |
| Hsich Wen Chuan | 0:12:12 | 0:32:47 | 0:26:06 | 1:11:05 | |
| Yi Chin Pu | 0:13:31 | 0:35:32 | 0:23:20 | 1:12:23 | |
| Nicole Danielle | 0:14:18 | 0:39:30 | 0:25:03 | 1:18:51 |
Men Open
| Rank | Name | Swim | Bike | Run | Total |
| 1 | Pascal Alonso | 0:13:52 | 0:30:52 | 0:22:03 | 1:06:47 |
| 2 | Lim Jia Jie | 0:13:54 | 0:31:02 | 0:22:47 | 1:07:43 |
| 3 | Kenta Endo | 0:12:09 | 0:32:48 | 0:23:59 | 1:08:56 |
Women Open
| Rank | Name | Swim | Bike | Run | Total |
| 1 | Sanruthai Arunsiri | 0:12:16 | 0:32:44 | 0:23:01 | 1:08:01 |
| 2 | จารวี เอี่ยมอรุณ | 0:24:34 | 0:41:54 | 0:29:27 | 1:35:55 |
| 3 | Soltani Sonia | 0:22:04 | 0:46:48 | 0:29:11 | 1:38:03 |