雙引擎反潛直升機,，海軍陸戰隊用做美國總統專機－陸戰隊一號，SH-3海王直昇機，反潛，反艦，救援、運輸、通訊、行政專機，空中預警，多用途運輸/工具直升機

SH-3「海王」直升機（SH-3 Sea King，在製造商內部則另使用 S-61的編號），是一款雙引擎反潛直升機，由美國直升機製造商賽考斯基飛機公司設計製造，服役於美國海軍和其他多國。除了在美國本土製造外，並授權給日本、英國、義大利等國家的特定廠商自行製造。除了軍用的SH-3之外，也有民用的雙生版本賽考斯基S-61。
The Sikorsky SH-3 Sea King (company designation S-61) is an American twin-engined anti-submarine warfare (ASW) helicopter designed and built by Sikorsky Aircraft. A landmark design, it was one of the first ASW rotorcraft to use turboshaft engines.The Sea King has its origins in efforts by the United States Navy to counter the growing threat of Soviet submarines during the 1950s. Accordingly, the helicopter was specifically developed to deliver a capable ASW platform; in particular, it combined the roles of hunter and killer, which had previously been carried out by two separate helicopters. The Sea King was initially designated HSS-2, which was intended to imply a level of commonality to the earlier HSS-1; it was subsequently redesignated as the SH-3A during the early 1960s.Introduced to service in 1961, it was operated by the United States Navy as a key ASW and utility asset for several decades prior to being replaced by the non-amphibious Sikorsky SH-60 Seahawk in the 1990s. In late 1961 and early 1962, a modified U.S. Navy HSS-2 Sea King was used to break the FAI 3 km, 100 km, 500 km, and 1000 km helicopter speed records. The Sea King also performed various other roles and missions such as search-and-rescue, transport, anti-shipping, medevac, plane guard, and airborne early warning operations.The Sea King has also proved to be popular on the export market with foreign military customers, and has also been sold to civil operators as well. As of 2015, many examples of the type remain in service in nations around the world. The Sea King has been built under license by Agusta in Italy, Mitsubishi in Japan, and by Westland in the United Kingdom as the Westland Sea King. The major civil versions are the S-61L and S-61N.