| Acronym | Meaning |
| OOC | Office of Citizenship (US CIS) |
| OOC | Office of Compliance (various organizations) |
| OOC | Office of Counsel (US Navy) |
| OOC | Officer of Cadets (Australian Defence Forces) |
| OOC | Operational Oceanography Center |
| OOC | Out of Calibration |
| OOC | Out of Committee (various locations) |
| OOC | Out of Course (Singapore Armed Forces) |
| OOC | Out of Cycle |
| OOC | Out-Of-Commission |