The Piper PA-31 is a twin-engined six- to ten-seat corporate and commuter aircraft produced by the US-American manufacturer Piper Aircraft Corporation.

The production models of the Piper PA-31 include the Navajo, the Pressurized Navajo with pressurized cabin, the Chieftain with stretched fuselage (+ 0,61m / 2 ft), the Mojave a piston engine variant of the Piper PA-31T Cheyenne and the commuter variants T-1020 and the T-1040. The Piper PA-31 was also licence-built in Argentina and Columbia and in Brazil by EMBRAER as the EMB-820 Navajo.