2025 British Motocross Championship

The 2025 ACU British Motocross Championship season was the 73rd British Motocross Championship season.
The MX1 class in 2024 was won by 5-time FIM Motocross World Champion Jeffrey Herlings, who did not defend his title. Similarly, reigning MX2 class champion Cas Valk did not return to race in the UK in 2025, meaning both classes were without the defending champions.
Former champion Conrad Mewse took his fifth national title in the MX1 class, regaining the crown he lost to Herlings in 2024. In the MX2 class, veteran Tommy Searle took his fifth British title overall and his first in the smaller capacity class.
After several seasons of being run by promoter RHL Activities, 2025 saw the championship return to be run in house by the ACU.