| Unit Name: | 521st Fighter-Bomber Squadron |
| Dates: | 1943-1944 |
| Country: |  United States |
| Branch: | Fighter-Bomber |
| Size: | Squadron |
| Aircraft Bomber: | A-24 Banshee P-39 Airacobra A-36 Apache B-25 Mitchell |
The 521st Fighter-Bomber Squadron is an inactive United States Air Force unit. Its last was assigned to the 415th Bombardment Group, stationed at Dalhart Army Airfield, Texas. It was inactivated on 5 Apr 1944.
Established in early 1943 as an A-24 dive bomber squadron. Assigned to the Army Air Forces School of Applied Tactics, Air University in Florida as a training unit to develop combat tactics to be used by overseas combat units. Also equipped with P-39 fighters and A-36 dive bombers with the phaseout of the A-24.
When AAFSAT closed, was re-assigned as a B-25 medium training squadron and supported Army maneuvers. Inactivated in April 1944 with re-organization of training command designations.
Activated on 15 Feb 1943.
Re-designated 521st Fighter-Bomber Squadron 10 Aug 1943.
Disbanded on 5 Apr 1944.