Operation Pierce Arrow was a U.S. bombing campaign at the beginning of the Vietnam War.
In response to the Gulf of Tonkin incident when the destroyers and of the United States Navy engaged North Vietnamese ships, sustaining light damage as they gathered electronic intelligence while in the international waters of the Gulf of Tonkin, U.S. President Lyndon B. Johnson ordered Operation "Pierce Arrow" which was conducted on 5 August 1964.
thumb|left|[[VFA-146|VA-146 A-4Cs from a week after Operation Pierce Arrow.]]
The operation consisted of 64 strike sorties of aircraft from the aircraft carriers and against North Vietnamese naval vessels (mostly Swatow gunboats—only two were torpedo boats) and the oil storage depot at Vinh. The U.S. lost two aircraft to anti-aircraft fire, with one pilot killed, Lieutenant Richard Sather, piloting an A-1 Skyraider. Another, Lt. (jg) Everett Alvarez Jr. an A-4 Skyhawk pilot, became the first U.S. Navy prisoner of war in Vietnam. The Soviet-made 14.5mm gun used to shoot down the A4 is now on display in Hanoi at the Air Defence Museum. North Vietnam claimed to have shot down eight U.S. aircraft.
Pilots estimated that the Vinh raid destroyed 10 percent of North Vietnam's entire petroleum storage, together with the destruction of or damage to 29 P-4 torpedo boats or gunboats.