The 1935 Mannin Moar (formally known as III Mannin Moar) was a Grand Prix that was held on 31 May 1935 at a street circuit in Douglas, Isle of Man. It was the thirteenth race of the 1935 Grand Prix season, but it did not count towards the championship. The race, contested over 50 laps of 4.035 mi, or 6.494 km, was won by Brian Lewis driving a Bugatti T59 after starting from pole position. He also won the two previous editions of the Mannin Moar.