Serhiy Volodymyrovych Tretyak is a retired Ukrainian professional footballer. Tretyak made his professional debut in the Soviet First League in 1982 for SKA Odessa. In 1992 Tretyak moved to Israel, accepting a 6-year contract from Beitar Jerusalem. He retired in 2001 and then worked for more than ten years as the manager of Beitar's youth team, he also worked as the assistant manager in the senior team from 2006 to 2009.