| Acronym | Meaning |
| CMO | Centre Militaire d'Océanographie (French: Military Oceanography Center) |
| CMO | Certificate Management Office |
| CMO | Chief Military Observer (US DoD) |
| CMO | Circuit Management Office |
| CMO | City Managers Office |
| CMO | Civil-Military Officer |
| CMO | Civil-Military Operations |
| CMO | Civil-Military Overview (NATO) |
| CMO | Clandestine Mission Objective |
| CMO | Collections Management Office(r) (US DoD) |
| CMO | Communications and Marketing Office (various locations) |
| CMO | Communications Management Organization |
| CMO | Configuration Management Office(r) |
| CMO | Congés de Maladie Ordinaire (French: Regular Sick Leave) |
| CMO | Contract Management Office |
| CMO | Controlled Materials Officer |
| CMO | Convoy Movement Order |
| CMO | Council of Ministers' Office (various organizations) |
| CMO | Court of Military Order (Congo) |
| CMO | Court-Martial Order (US military) |
| CMO | Coverage Mission Order |
| CMO | Crisis Management Operations |
| CMO | Crisis Management Organization |
| CMO | Customs Memorandum Order (Philippines) |