English abbreviations from ocnm to ocs
- OCNM (Oklahoma City National Memorial)
- OCNMT (Oklahoma City National Memorial Trust)
- OCO (Oort Cloud Object)
- OCOKA (Observation and fields of fire, Cover and concealment, Obstacles, Key terrain, and Avenues of Approach.)
- OCONUS (Outside the Continental United States)
- O-CONUS (Outside Continental United States)
- OCOP (Outline Contingency Operation Plan)
- OCP (Official Community Plan)
- OCPA (Office of the Chief of Public Affairs)
- OCPP (Oshkosh Community Playground Project)
- OCR (Office of Collateral Responsibility)
- O.C.R. (Ordo Reformatorum Cisterciensium (Cistercians, Trappists))
- OCRE (Organizations Concerned about Rural Education)
- OCRF (Ovarian Cancer Research Fund)
- OCRFSAC (Ovarian Cancer Research Fund Scientific Advisory Committee)
- OCRR (Organisation for Conflicts Resolution and Reconciliation)
- OCS (Officer Candidate School, located at Naval Station Newport)