William Dunlop (born 23 July 1985) is a Northern Irish motorcycle racer, brother of Isle of Man TT winner Michael, the son of the late Robert, and the nephew of legendary TT racer Joey Dunlop. William started racing 125 cc bikes at the age of 17.

Until late 2015, he raced for Tyco BMW Motorrad Racing aboard a BMW S1000RR and a Suzuki GSX-R600, but for 2016 he is contracted to ride in International road races aboard Yamaha YZF-R1 and Yamaha YZF-R6 for Superbike and Supersport, with a Kawasaki ZX-10R Superstock machine provided by a different team, also to include selected rounds of the British Championship.

Dunlop has competed in nine TT race seasons between 2006 and 2015, with two seconds and four third places being his best results, in the 125 cc, SuperSport and Classic races. He won two races at the North West 200 with his first victory being in the 2009 250 cc event. 2009 also saw Dunlop take part in the last ever 250cc Grand Prix race at Valencia finishing 18th on a P J Flynn Bigman Racing Honda.

Dunlop crashed his Tyco Suzuki Superbike in the final race of the week at the 2014 Isle of Man TT, during the Senior TT event. He led the race on time briefly during the first lap, but ran wide through the Graham Memorial corner on the mountain section on the third lap, running off the road up against the adjacent embankment, resulting in two fractures to his left leg.

Dunlop got his 2015 season off to a positive start by clinching a brace of wins at a rain-soaked Tandragee 100. In the Supersport Class, Dunlop put in a very convincing performance on board the CD Racing Yamaha YZF-R6 and rounded the meeting off by taking victory in the Senior Open Race on the TAS BMW S1000RR.

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