Janusz "John" Kowalik (born 26 March 1944) is a Polish former football manager and player who played as a striker.

In 1968, the owners of the Chicago Mustangs of the North American Soccer League (NASL) signed Kowalik.

The Clippers decided to leave the NASL, join a local league and exist on playing exhibition games against foreign teams.

Kowalik returned to the NASL with the Chicago Sting in 1975, where he played fourteen games, scoring nine goals in 1976.

Kowalik later coached Vitesse Arnhem, Górnik Zabrze and Rangers International of Enugu.