Harold Daniell (29 October 1909 – 19 January 1967) was a British professional Grand Prix motorcycle road racer and auto racing driver.

On retiring from racing he owned a Norton motorcycle dealership in Forest Hill, London.

Harold Daniell and George Rowley rode the supercharged AJS V4s in the 1936 Isle of Man Senior TT, but despite its high top speed, it lacked acceleration.

Daniell competed in the 1949 Grand Prix motorcycle racing season riding on a 500cc Norton and finished sixth overall with 17 points in the World Championship while Leslie Graham and Nello Pagani finished first and second respectively.

[3] His victory in the Senior TT makes him the first race winner of the MotoGP (then 500 cc) class.