| Birth Date: | 17 November 1961 |
| Birth Place: | Kyiv, Ukrainian SSR, Soviet Union |
| Death Date: | July 1994 (aged 32)[1] |
| Height: | 1.9m (06.2feet) |
| Weight: | 78kg (172lb) |
| Club: | Spartak Kyiv |
| Show-Medals: | yes |
Serhiy Oleksandrovych Krasyuk (also Sergey; Ukrainian: Сергій Олександрович Красюк; 17 November 1961 - July 1994) was a Ukrainian swimmer. He won a gold and silver medal at the 1980 Summer Olympics in the 4 × 100 m medley and 4 × 200 m freestyle relays, respectively; in both events he swam for the Soviet Unions team in the preliminary rounds. Individually he finished in sixth place in the 100 m freestyle. After the Olympics he won several medals at the world and European championships. He missed the 1984 Summer Olympics due to their boycott by the Soviet Union and competed in the Friendship Games instead, winning a gold, silver and bronze medal.