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