De Havilland Gipsy Major

Gipsy Major
Gipsy Major 31 engine on display at the de Havilland Aircraft Museum
Type	Piston inline aero-engine
Manufacturer	de Havilland Engine Company
First run	1932
Major applications	de Havilland Tiger Moth de Havilland Canada Chipmunk
Number built	14,615
Developed from	de Havilland Gipsy
Developed into	de Havilland Gipsy Six

The de Havilland Gipsy Major or Gipsy IIIA is a four-cylinder, air-cooled, inverted inline engine used in a variety of light aircraft produced in the 1930s, including the famous Tiger Moth biplane. Many Gipsy Major engines still power vintage aircraft types.

Engines were produced by de Havilland in the UK and by the Australian arm of the company, de Havilland Australia, the latter modifying the design to use imperial measures rather than the original metric measurements.^{[citation needed]}