The Britten-Norman Trislander (more formally designated the BN-2A Mk III Trislander) is a three-engined piston-powered utility aircraft designed and produced by the British aircraft manufacturer Britten-Norman.

The Trislander was designed in the late 1960s as a expanded derivative of the company's Islander, a twin-engined commercial aircraft that had proved to be a commercial success. In comparison to its predecessor, it had a larger carrying capacity, being capable of seating up to 18 passengers, and could also perform STOL operations when required.[1] On 11 September 1970, the prototype Trislander performed its maiden flight; the type entered revenue service less than a year later.