49 Squadron
- 49th Aero Squadron
- 49th Air Transport Squadron
- 49th Bombardment Squadron
- 49th Brigade (disambiguation)
- 49th Division (disambiguation)
- 49th Fighter Training Squadron
- 49th Pursuit Squadron
- 49th Regiment (disambiguation)
- 49th Test and Evaluation Squadron
- 49th Troop Carrier Squadron
- Marine Aviation Logistics Squadron 49
- No. 49 Squadron IAF
- No. 49 Squadron RAF
- VP-49