The Roe III Triplane was an early British aircraft. In configuration, it was similar to the Roe II Triplane, with a triplane tailplane and an open-top fuselage of triangular cross-section, but the Roe III was a two-seater, and featured ailerons for the first time in a Roe design. The five (some sources give three) production machines differed from the prototype in having the ailerons fitted to the middle wing (the prototype's were on the upper wing) and in being powered by a Green engine in place of the prototype's JAP.