303 Squadron or 303rd Squadron may refer to:
- No. 303 Squadron RAF
- No. 303 Squadron RNLAF
- 303d Aero Squadron, Air Service, United States Army; see list of American aero squadrons
- 303d Fighter Squadron (World War II), United States Army Air Forces
- 303d Troop Carrier Squadron, a World War II United States Army Air Forces unit
- 303rd Fighter Squadron, United States Air Force
- 303rd Intelligence Squadron, United States Air Force
- 303rd Expeditionary Rescue Squadron, United States Air Force
See also
- Squadron 303 (book), about the RAF unit
- Hurricane: 303 Squadron, film about the RAF unit
- 303 Squadron (film), about the RAF unit