Adrianus Johannes Bak (born June 18, 1926, Rotterdam) is a former Dutch professional footbal player.

Bak started his career in the team of Excelsior Rotterdam. Between 1955 an 1962 he was midfielder for Feyenoord Rotterdam. Here he won twice, 1961 and 1962, the national Dutch championship.

In 1956 he earned his only cap in the Netherlands national football team.

At the age of 36 he retired from football and became teller for Amro Bank .