William David Ivy (27 August 1942 – 12 July 1969) was an English professional Grand Prix motorcycle racer from Maidstone, Kent.

Entering his first TT race in 1962 on a Chisholm Itom,[2] he later progressed to ride a variety of machinery on UK short circuits including Honda, Bultaco, Yamaha, Norton, Cotton, and Matchless machines.

[3] Ivy's big break into Grand Prix motorcycle racing came towards the end of 1965, when he was selected as a stand-in and flown to Japan in October by Yamaha due to regular rider Mike Duff crashing in practice for the Japanese GP, suffering a broken thigh.

[4] In 1966, he won his first race as a regular rider for the works Yamaha team in the first race of the year, the Spanish Grand Prix at the Montjuic Park Circuit, Barcelona in Spain,[5] and took three more wins—not enough, however, to beat Swiss rider Luigi Taveri, who beat Ivy to the title by six points.

He was in the 1965 James Bond film Thunderball as the stunt man, wearing a blond wig to make him look more like the character in the action sequence.

He and the bike slid off the track where he impacted an unprotected fence post before bouncing back to the edge of the racing surface.