3 Squadron
3 Squadron or 3rd Squadron may refer to:
Aviation squadrons
- No. 3 Squadron RAF
- No. 3 Squadron RAAF
- No. 3 Squadron RCAF
- No. 3 Squadron RNZAF
- No. 3 Squadron, Indian Air Force
- No. 3 Squadron RAF Regiment, a British field squadron
- 3rd Air Squadron, Indonesia
- 3rd Tactical Squadron, Poland
- 3rd Tactical Fighter Squadron (JASDF), Japan
United States
- 3rd Airlift Squadron
- 3rd Fighter Training Squadron
- 3rd Special Operations Squadron
- 3rd Weather Squadron
Naval squadrons
- 3rd Battle Squadron, Royal Navy
- 3rd Battlecruiser Squadron, Royal Navy