| Aad Bak | |
| Fullname: | Adrianus Johannes Bak |
| Birth Date: | 18 June 1926 |
| Birth Place: | Rotterdam, Netherlands |
| Death Date: | [1] |
| Death Place: | Schiedam, Netherlands |
| Position: | Midfielder |
| Youthclubs1: | Excelsior |
| Youthclubs2: | FC Rotterdam |
| Years1: | 1954–1955 |
| Years2: | 1955–1962 |
| Clubs1: | Holland Sport |
| Clubs2: | Feijenoord |
| Caps2: | 133 |
| Goals2: | 11 |
| Nationalyears1: | 1956 |
| Nationalteam1: | Netherlands |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
| Pcupdate: | 4 June 2007 |
| Ntupdate: | 4 June 2007 |
Adrianus ("Aad") Johannes Bak (Rotterdam, South Holland, 18 June 1926 - 16 January 2009 Schiedam, South Holland[2]) was a Dutch professional football player.
Bak started his career in the team of Excelsior. He played for Holland Sport during the 1954–55 season.[3] Between 1955 and 1962, he played in the midfielder position for Feijenoord. While there, he won two Dutch national championships, in 1961 and 1962.
Bak received his only cap in the Netherlands national football team in 1956.[1]