William Dunlop (23 July 1985 – 7 July 2018) was a professional motorcycle racer from Northern Ireland who died as a result of a racing incident. Part of a motorcycle racing dynasty, William was the elder brother of Michael Dunlop; both were sons of the late Robert Dunlop, and nephews of the late Joey Dunlop. He died as a result of a crash at a racing event in the Republic of Ireland.