The Women Airforce Service Pilots (WASP) (also Women's Army Service Pilots or Women's Auxiliary Service Pilots) was a civilian women pilots' organization, whose members were United States federal civil service employees. Members of WASP became trained pilots who tested aircraft, ferried aircraft, and trained other pilots. Their purpose was to free male pilots for combat roles during World War II. Despite various members of the armed forces being involved in the creation of the program, the WASP and its members had no military standing.

WASP was preceded by the Women's Flying Training Detachment (WFTD) and the Women's Auxiliary Ferrying Squadron (WAFS). Both were organized separately in September 1942. They were pioneering organizations of civilian women pilots, who were attached to the United States Army Air Forces to fly military aircraft during World War II. On August 5, 1943, the WFTD and WAFS merged to create the WASP organization.

The WASP arrangement with the US Army Air Forces ended on December 20, 1944. During its period of operation, each member's service had freed a male pilot for military combat or other duties. They flew over 60 million miles; transported every type of military aircraft; towed targets for live anti-aircraft gun practice; simulated strafing missions and transported cargo. Thirty-eight WASP members died during these duties and one, Gertrude Tompkins, disappeared while on a ferry mission, her fate still unknown. In 1977, for their World War II service, the members were granted veteran status, and in 2009 awarded the Congressional Gold Medal.