| Siarhei Byk | |
| Fullname: | Siarhei Aliaksandrovich Byk |
| Residence: | Brest, Belarus |
| Birth Date: | 8 July 1990 |
| Height: | 1.92m (06.3feet) |
| Weight: | 80kg (180lb) |
| Weapon: | Foil |
| Hand: | right-handed |
| Club: | SCAF RB(Past) Star Fencing Academy(Present) |
| Fieranking: | current ranking |
Siarhei Byk (Belarusian: Сергей Александрович Бык; born 8 July 1990) is a Belarusian foil fencer, member of the national team.
Byk earned a silver medal in the 2011 U23 European Championships in Kazan[1] and a bronze medal in the 2013 edition of the same competition in Toruń. He reached the quarter-finals at the 2013 European Fencing Championships in Zagreb, but was defeated by James-Andrew Davis of Great Britain.[2]