The Motorsport UK British Rallycross Championship is an auto racing Rallycross series, running in the United Kingdom. From 2020, the championship became known as the Motorsport UK British Rallycross Championship 5 Nations Trophy presented by Cooper Tire.

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The championship is recognised as an official Championship by Motorsport UK which is the governing body of Motorsport in Great Britain.

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The current format consists of the Motorsport UK Supercars (600Hp+ Vehicles with 4WD based upon hatchbacks), The Supernational and All4Mini's, the BMW Mini Class, the Retro Rallycross, the Swift Sport, Swift Junior championship and RX150s.