Back Сюй Сы Byelorussian Xu Si German Xu Si Spanish Xu Si French Xu Si Italian Xu Si Dutch Xu Si Polish
 Xu at the 2017 Paul Hunter Classic | |
| Born | 24 January 1998 Jieyang, Guangdong, China |
|---|---|
| Sport country |  China |
| Professional | 2017–present |
| Highest ranking | 40 (February 2025) |
| Current ranking | 40 (as of 17 February 2025) |
| Maximum breaks | 3 |
| Best ranking finish | Semi-final (x2) |
Xu Si (Chinese: 徐思; born 24 January 1998) is a Chinese professional snooker player.