Harold Daniell (29 October 1909 – 19 January 1967) was a British professional Grand Prix motorcycle road racer and auto racing driver. He competed in the 1940s and 1950s. On retiring from racing he owned a Norton motorcycle dealership in Forest Hill, London. Harold Daniell and rode the supercharged AJS V4s in the 1936 Isle of Man Senior TT, but despite its high top speed, it lacked acceleration. Both riders retired due to mechanical problems.