The Chance Vought F4U Corsair was a carrier-capable fighter aircraft that saw service primarily in World War II and the Korean War. Goodyear-built Corsairs were designated FG and Brewster-built aircraft F3A. The Corsair served in smaller air forces until the 1960s, following the longest production run of any piston-engined fighter in U.S. history (1942–1952). Some Japanese pilots regarded it as the most formidable American fighter of World War II. The U.S. Navy counted an 11:1 kill ratio with the F4U Corsair.

Corsairs served with the U.S. Navy, U.S. Marines, Fleet Air Arm and the Royal New Zealand Air Force, as well the French Navy Aeronavale and other services postwar. It quickly became the most capable carrier-based fighter-bomber of World War II. Demand for the aircraft soon overwhelmed Vought's manufacturing capability, resulting in production by Goodyear (as the FG-1) and Brewster (as the F3A-1). From the first prototype delivery to the U.S. Navy in 1940, to final delivery in 1953 to the French, 12,571 F4U Corsairs were manufactured by Vought,^[5] in 16 separate models.

The Corsair entered service in 1942. Although designed as a carrier fighter, initial operation from carrier decks proved to be troublesome. Its low-speed handling was tricky due to the port wing stalling before the starboard wing. This factor, together with poor visibility over the long nose (leading to one of its nicknames, "The Hose Nose"), made landing a Corsair on a carrier a difficult task. For these reasons, most Corsairs initially went to Marine Corps squadrons who operated off land-based runways, with some early Goodyear built examples (designated FG-1A) being built with fixed, non-folding wings.^[33] The USMC aviators welcomed the Corsair with open arms as its performance was far superior to the contemporary Brewster Buffalo and Grumman F4F-3 and -4 Wildcat.

Moreover, the Corsair was able to outperform the primary Japanese fighter, the A6M Zero. While the Zero could out-turn the F4U at low speed, the Corsair was faster and could out-climb and out-dive the A6M.^[88] Tactics developed early in the war, such as the Thach Weave, took advantage of the Corsair's strengths.

This performance advantage, combined with the ability to take severe punishment, meant a pilot could place an enemy aircraft in the killing zone of the F4U's six .50 (12.7 mm) M2 Browning machine guns and keep him there long enough to inflict major damage. The 2,300 rounds carried by the Corsair gave over one full minute of fire from each gun, which, fired in three to six-second bursts, made the F4U a devastating weapon against aircraft, ground targets, and even ships.

Beginning in 1943, the Fleet Air Arm (FAA) also received Corsairs and flew them successfully from Royal Navy carriers in combat with the British Pacific Fleet and in Norway. These were clipped-wing Corsairs, the wingtips shortened 8 in (20 cm) to clear the lower overhead height of RN carriers. FAA also developed a curving landing approach to overcome the F4U's deficiencies.

Infantrymen nicknamed the Corsair "The Sweetheart of the Marianas" and "The Angel of Okinawa" for its roles in these campaigns. Among Navy and Marine aviators, however, the aircraft was nicknamed "Ensign Eliminator" and "Bent-Wing Eliminator" because it required many more hours of flight training to master than other Navy carrier-borne aircraft. It was also called simply "U-bird" or "Bent Wing Bird". The Japanese allegedly nicknamed it "Whistling Death", for the noise made by airflow through the wing root-mounted oil cooler air intakes.

The Corsair has been named the official aircraft of Connecticut,due to its connection with Sikorsky Aircraft, in legislation sponsored by state senator George "Doc" Gunther; Gunther had also organized a Corsair Celebration and Symposium at Sikorsky Memorial Airport in Stratford, Connecticut, on Memorial Day, 29 May 2006.