GT League is a game mode that was added in the Campaign section of Gran Turismo Sport as part of update 1.10, released on December 22, 2017. Similarly to the Gran Turismo Mode of previous games, this game mode includes several series of races that have appeared in past GT titles such as Sunday Cup, Clubman Cup, FF Challenge, FR Challenge, Mazda Roadsters Cup and more.
The events in GT League mode are divided in four categories: Beginner, Amateur, Professional and Endurance. At the start of the game, only the Beginner category can be accessed, while the Amateur, Professional and Endurance categories can be accessed upon reaching Level 10, Level 20 and Level 30, respectively. As of update 1.59, there are a total of 299 races (46 events) in GT League.