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.

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