The Grumman F6F Hellcat was an American carrier-based fighter aircraft designed to replace the earlier F4F Wildcat inUnited States Navy (USN) service. The Hellcat competed with the faster Vought F4U Corsair for use as a carrier based fighter. The Corsair had significant issues with carrier landings which the Hellcat did not, allowing the Hellcat to become the Navy's dominant fighter in the second part of World War II, a position the Hellcat did not relinquish. The Corsair instead was primarily deployed to great effect in land-based use by the U.S. Marine Corps.

Although the F6F resembled the Wildcat in some ways, it was a new design, powered by a 2,000 hp Pratt & Whitney R-2800, the same powerplant used for both the Corsair and the United States Army Air Force (USAAF) Republic P-47 Thunderbolt fighters. Some military observers tagged the Hellcat as the "Wildcat's big brother".