The Martin Handasyde No.3 was an early British single-seat monoplane design, built in partnership by H.P.

The Martin-Handasyde No.3 bore a strong resemblance to the Antoinette monoplanes, with a slender wood-covered triangular fuselage, and tapered wings which were braced by mid-span kingposts.

The undercarriage consisted of a pair of wheels on a cross-axle supplemented by a forward-projecting curved skid.

Martin during November 1910, and was flown throughout 1912 by Graham Gilmour, who was eventually killed in the aircraft when it suffered a mid-air structural failure over Richmond Park on 17 February 1912.

[1] A two-seater version of the aircraft, the Martin Handasyde 4B, also called the Dragonfly, with a wingspan of 37 ft (11 m) was built for Thomas Sopwith and was displayed at the 1911 Aero Show at Olympia.