The AgustaWestland AW139, now known as the Leonardo AW139, is a 15-seat medium-sized twin-engined helicopter developed and produced by the Anglo-Italian helicopter manufacturer AgustaWestland, now part of Leonardo. It is marketed at several different roles, including VIP/corporate transport, military use, offshore transport, firefighting, law enforcement, search and rescue, emergency medical service, disaster relief, and maritime patrol.

AgustaWestland was an Anglo-Italian helicopter design and manufacturing company, which was a wholly owned subsidiary of Finmeccanica. It was formed in July 2000 as an Anglo-Italian multinational company, when Finmeccanica and GKN merged their respective helicopter subsidiaries to form AgustaWestland, with each holding a 50% share. Finmeccanica acquired GKN's stake in AgustaWestland in 2004.