504th may refer to:
- 504th Battlefield Surveillance Brigade (BfSB), located at Fort Hood, Texas
- 504th Bombardment Group (504th BG), a World War II United States Army Air Forces combat organization
- 504th Expeditionary Air Support Operations Group, active United States Air Force unit
- 504th Fighter Squadron or 137th Airlift Squadron flies the C-5 Galaxy and the C-17A Globemaster III
- 504th Infantry Regiment (United States) (504th PIR) is an airborne infantry regiment in the United States Army
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