Jack Sack (February 22, 1902 – March 7, 1980; born Jacob Bernard Sacklowsky) was an American football player and coach.

[2] Sack was born in Pittsburgh, Pennsylvania, was of Russian-Polish extraction, and was Jewish.

[8] In 1926, Sack signed on with the Canton Bulldogs of the NFL, where he played under future Hall of Fame coach Pete Henry.

[7] Sack was the 12th head football coach at Geneva College in Beaver Falls, Pennsylvania, serving for one season, in 1924, and compiling a record of 3–4–2.

[11] Sack was inducted into the Jewish Sports Hall of Fame of Western Pennsylvania in 1992.