Billy Fessler
| Current position | |
|---|---|
| Title | Quarterbacks coach |
| Team | Ohio State |
| Conference | Big Ten |
| Biographical details | |
| Born | August 6, 1995 Erie, Pennsylvania, U.S. |
| Playing career | |
| 2014–2017 | Penn State |
| Position(s) | Quarterback |
| Coaching career (HC unless noted) | |
| 2018 | Slippery Rock (GA) |
| 2019 | Mississippi State (GA) |
| 2020–2021 | Ohio State (GA) |
| 2022 | Akron (QB) |
| 2023 | Akron (OC/QB) |
| 2024 | Ohio State (analyst) |
| 2025–present | Ohio State (QB) |
William Gallagher Fessler (born August 6, 1995) is an American college football coach. He is the quarterbacks coach for Ohio State University, a position he has held since 2025. He also coached for Slippery Rock, Mississippi State, and Akron. He played college football for Penn State as a quarterback.