Serhiy Demydyuk (born June 5, 1982) is a Ukrainian hurdler.
He won a bronze medal at the 2003 Summer Universiade, and competed at the 2004 Olympics where he was knocked out in the heats.
He finished eighth in the 110 m hurdles final at the 2006 European Athletics Championships, and fifth in 60 m hurdles at the 2007 European Indoor Championships.
His personal best time is 13.22 seconds, achieved in August 2007 in Osaka (6th in World Champs).
This biographical article relating to Ukrainian athletics is a stub.