O4
O4 may refer to:
- SP&S Class O-4, a steam locomotives class
- LNER Class O4, a class of ex Great Central Railway 2-8-0 steam tender locomotives
- USS O-4 (SS-65), a United States O class submarine
- O-4, the pay grade for the following officer ranks in the U.S. uniformed services:
- Major in the Army, Air Force, and Marine Corps
- Lieutenant Commander in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
- Tetraoxygen (O4)
- a class of stars in the stellar classification
- Otoyol 4, a Turkish highway from Istanbul to Ankara
See also
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