2025 British Motocross Championship

The 2025 ACU British Motocross Championship season (known for sponsorship reasons as the Motul ACU British Motocross Championship) is the 73rd British Motocross Championship season.

The MX1 class in 2024 was won by 5-time FIM Motocross World Champion Jeffrey Herlings, who will not defend his title. Similarly, reigning MX2 class champion Cas Valk will not return to race in the UK in 2025, meaning both classes will be without the defending champions.

After several seasons of being run by promoter RHL Activities, 2025 will see the championship return to be run in house by the ACU.