2025 GB4 Championship

The 2025 GB4 Championship partnered by the BRDC was the fourth season of a motor racing championship for open wheel, formula racing cars in Britain. The 2025 season, which was organised by MotorSport Vision, ran over seven triple-header rounds.

GB4 acted as a direct feeder series to higher open-wheel categories, including the existing GB3 Championship partnered by the BRDC. GB4 ran primarily on the same British GT race programme as GB3, and retained many of the same championship partners.