| Jack Petoskey | |
| Birth Date: | 15 October 1921 |
| Birth Place: | Saginaw, Michigan, U.S. |
| Death Place: | Zephyrhills, Florida, U.S. |
| Player Years1: | 1941–1943 |
| Player Team1: | Michigan |
| Player Positions: | End |
| Coach Years1: | 1947–1948 |
| Coach Team1: | St. Joseph HS (MI) |
| Coach Years2: | 1949–1950 |
| Coach Team2: | Hillsdale |
| Coach Years3: | 1953–1956 |
| Coach Team3: | Western Michigan |
| Overall Record: | 19–32–3 (college) 7–5–3 (high school) |
| Bowl Record: | 0–1 |
| Championships: | 1 MIAA (1949) |
Ernest Jack Petoskey[1] (October 15, 1921 – March 3, 2017)[2] was an American football player and coach. He served as the head football coach at Hillsdale College from 1949 to 1950 and Western Michigan University from 1953 to 1956, compiling a career college football record of 19–32–3. A native of Dearborn, Michigan, Petoskey played college football at an end at the University of Michigan from 1940 to 1943. He then served in the United States Navy during World War II.
Petoskey was the head football coach for the Hillsdale College in Hillsdale, Michigan. He held that position for the 1949 and 1950 seasons. His coaching record at Hillsdale was 11–7–1.[3] Before going to Hillsdale he was head football coach at St. Joseph High School in St. Joseph, Michigan from 1947 to 1948, where his record was 7–5–3. He was an assistant at Western Michigan before being named head coach.