Petr Kostelník (born 5 February 1964) is a retired football goalkeeper who represented the Czechoslovakia national football team, winning three caps.
He played club football in Prague for Sparta and Dukla.
He also played for Lázne Bohdanec.
In the Gambrinus liga, Kostelník played 47 matches for teams including Sparta, Bohdanec and Žižkov.Kostelník suffered a non-fatal heart attack in 2006 at the age of 42, while working as assistant coach at Bohemians 1905.