O7

O7 may refer to:
 * O7 star, a subclass of O-type stars
 * LNER Class O7, a class of British steam locomotives
 * O7, the IATA airline designator for OzJet
 * o7, an emoticon for a person saluting
 * O-7, a pay grade in the US uniformed services:
 * Brigadier General in the Army, Marine Corps, Air Force, and Space Force
 * Rear admiral (lower half) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps