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The 820th Bombardment Squadron is an inactive United States Air Force unit. Its last assignment was with the 41st Bombardment Group, based at Fort Lawton, Washington. It was inactivated on 4 January 1946.
Formed in late 1942 and equipped with Lockheed Ventura antisubmarine patrol aircraft. Assigned to Third Air Force and performed antisubmarine patrols over the Southeast Atlantic coast until July 1943.
Realigned as a B-25 Mitchell medium bomber squadron after the Navy took over the antisubmarine mission. Trained under Third Air Force, then deployed to California before being deployed to Seventh Air Force. Completed final training in Hawaii and moved to Tarawa in the Central Pacific in December 1943. Entered combat and attacked enemy installations, airfields, and shipping in the Marshall Islands in preparation for the invasion by US forces, and after February 1944 staged through captured fields on Eniwetok to attack shipping in the Caroline Islands.
In April 1944 moved to Makin where its missions were directed primarily against shipping and bypassed islands in the Marshalls and Carolines. Returned to Hawaii in October 1944 for training with rockets and new B-25's. Moved to Okinawa, May–June 1945. Bombed airfields, railways, and harbor facilities on Kyushu until August 1945. Also flew some missions against airfields in China.
Moved to Manila in December 1945. Inactivated in the Philippines on January 27, 1946.
- Constituted 521st Bombardment Squadron (Heavy) on 13 October 1942
- Activated on 18 October 1942
- Redesignated: 16th Antisubmarine Squadron (Heavy) on 29 November 1942
- Redesignated: 820th Bombardment Squadron (Medium) on 22 September 1943
- Inactivated on 4 January 1946.
- Charleston AAF, South Carolina, 18 October 1942
- Hammer Field, California, 22 September-5 October 1943
- Hickam Field, Territory of Hawaii, October 20, 1943
- Hawkins Field, Tarawa, Gilbert Islands, 24 December 1943
- Makin Airfield, Makin, Gilbert Islands, April 21, 1944
- Wheeler Field, Territory of Hawaii, 14 October, 1944
- Yontan Airfield, Okinawa, June 7, 1945
- Fort Lawton, Washington, 1-4 January 1946
This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency.