The AgustaWestland AW139 (Agusta-Bell AB139) is a medium 17-seat twin-engine multi-purpose helicopter produced by the Anglo-Italian manufacturer AgustaWestland. This helicopter type is mostly in operation with civil operators for executive passenger transport (VIP), emergency medical service (EMS), search and rescue operations (SAR), law enforcement and offshore passenger and material transportation.

Developed together with Bell Helicopter as AgustaBell AB139. Bell sold their rights on to AgustaWestland. The first produced helicopters (c/n 31001 – 31054) are named AB139, all later produced are named AW139.