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O3
O3 may refer to:
Science and technology
- Ozone (O<sub>3</sub>), an allotrope of oxygen
- , the ozonide anion
- O(3), the 3-dimensional orthogonal group in group theory
- O3 star, a subclass of the O-type star stellar classification
- Haplogroup O3 (Y-DNA), a Y-DNA Haplogroup
- OpenAI o3, an artificial intelligence model
Music
Military
- O-3, a uniformed services pay grade of the United States for the following:
- Captain (United States O-3), in the Army, Marine Corps, Air Force, and Space Force
- Lieutenant (navy), in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
- USS O-3 (SS-64), a 1917 United States O class submarine
Transportation
Other uses
See also