| Chatchai Koompraya | |
| Fullname: | Chatchai Koompraya |
| Birth Date: | 1984 4, df=yes |
| Birth Place: | Suphan Buri, Thailand |
| Height: | 1.71 m |
| Position: | Midfielder |
| Youthclubs1: | Suphanburi |
| Years1: | 2005–2010 |
| Clubs1: | Suphanburi |
| Years2: | 2011–2016 |
| Clubs2: | Bangkok United |
| Caps2: | 45 |
| Goals2: | 1 |
| Years3: | 2016 |
| Clubs3: | → Chainat Hornbill (loan) |
| Years4: | 2017–2022 |
| Clubs4: | Chainat Hornbill |
| Caps4: | 106 |
| Goals4: | 4 |
Chatchai Koompraya (th|ฉัตรชัย คุ้มพญา, born April 3, 1984), or simply known as Chai (th|ชัย), is a Thai professional footballer who plays as an midfielder.