There's no single definitive list because different sources use different criteria and data. However, some of the quarterbacks consistently appearing near the top of any such list include:
* Graham Mertz (Wisconsin): While he didn't have the most wins, his high winning percentage makes him a strong contender depending on how you define "winningest."
* Peyton Manning (Tennessee): A legendary quarterback, he had a high win percentage and significant wins during his college career.
* Colt McCoy (Texas): Known for his high win total and consistent success at Texas.
Determining an exact ranking is difficult due to variations in data availability and the criteria used. To find a precise answer, you would need to specify your definition of "winningest" and consult multiple college football record databases.