Frederick Charles Slack (19101965) was an American swing and boogie-woogie pianist and bandleader.

Slack played the piano solo on Will Bradley's recording of "Beat me Daddy, Eight to the Bar," one of the early white boogie-woogie hits. After forming his own band in 1942 he quickly had a hit with "Cow Cow Boogie," sung by Ella Mae Morse. This band also had a hit with "Strange Cargo."

Slack also recorded as an accompanist for Big Joe Turner.