| Sitthichok Tassanai | |
| Fullname: | Sitthichok Tassanai |
| Birth Date: | 1991 6, df=yes |
| Birth Place: | Chonburi, Thailand |
| Currentclub: | Police Tero |
| Clubnumber: | 41 |
| Position: | Defensive midfielder |
| Youthyears1: | 2007–2010 |
| Youthclubs1: | Bangkok Sports School |
| Years1: | 2011–2014 |
| Clubs1: | Bangkok |
| Caps1: | 64 |
| Goals1: | 3 |
| Years2: | 2015– |
| Clubs2: | Police Tero |
| Caps2: | 127 |
| Goals2: | 0 |
| Club-Update: | 26 May 2024 |
| Nationalteam-Update: | 13 May 2023 |
Sitthichok Tassanai (th|สิทธิโชค ทัศนัย; born 7 June 1991), simply known as Tun (th|ตุ๋น), is a Thai professional footballer who plays as a defensive midfielder for Thai League 1 club Police Tero.[1]