Karl Zankl († 3 October 1945) was an Austrian football player and coach.
He played for Cricketer, Polizei SV and Wiener Sport-Club as midfielder. With Sport-Club he became Austrian champion 1922 and Cup winner 1923. During the Second World War he was engaged in a resistance group against the nazis. At the end of the war he tried to reestablish the Austrian Football Federation (ÖFB). He also formed a national football team and became the first coach of the post war aera. He also was the first president of the Vienna Football association after the World War.