O9 or O-9 may refer to:
- USS O-9 (SS-70), an O-class submarine of the United States Navy
- O-9, the pay grade for the following senior officer ranks in the U.S. uniformed services:
- Lieutenant General in the Army, Marine Corps, Air Force, and Space Force
- Vice Admiral in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
- Douglas O-9, a variant of the Douglas O-2, a 1920s American observation aircraft
- O9 (model railways)
- Oregon-IX (OIX), an internet exchange; see List of Internet exchange points
See also
- 09 (disambiguation)
- oix (disambiguation)
- All pages with titles containing O-9
- All pages with titles beginning with O9
- All pages with titles containing O9
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