| Caribbean Meteorological Organization | Academic & Science |
| Compact Massive Object | Academic & Science |
| Obbia | Airport Code |
| Career Mobility Office | Business |
| Certified Municipal Official | Business |
| Chief Marketing Office | Business |
| Commercial Microwave Organization | Business |
| Collateralized mortgage obligations | Business |
| chief marketing officer's | Business |
| Container Movement Order | Business |
| Charter Management Organization | Business |
| Chief Management Officer | Business |
| Care Management Organizations | Business |
| Capstead Mortgage Corporation | Business |
| Chef Marketing Officer | Business |
| Collective Management Organization | Business |
| College of Midwives of Ontario | Business |
| Certificate Management Office | Business Management |
| Certificate Management Offices | Business Management |
| Current Management Object | Business Management |
| Cyclohexanone Monooxygenase | Chemistry |
| Catholic Men Organization | Community |
| Cash Management Online | Computing |
| Casual Multiplayer Online | Computing |
| Cyber Monsters Online | Computing |
| Continuous Media Object | Computing |
| Current Mode of Operation | Computing |
| Chi Mei Optoelectronics | Electronics |
| Chief Meaning Officer | General |
| Campaign Monitor and Optimization | General |
| Cheap Marketing Officer | General |
| Course Materials Online | General |
| Comfort Measures Only | General |
| Contract Manufacturing Operations | General |
| Cubic Mile Of Oil | General |
| Carpathian Mountain Outreach | General |
| Contrucciones Metalicas de Obturacion | General |
| Contract Manufacturing Operation | General |
| Chief Mommy Officer | General |
| Contract Manufacturing Organization | General |
| Chief Motivational Officer | General |
| Current Market Outlook | General |
| Corporate Money Offering | General |
| Canonical Molecular Orbital | General |
| Calculated Mean Organism | General |
| Commercial Market Outlook | General |
| Customer Material Order | General |
| Conventional Mineral Oil | General |
| Contract Management Organization | Governmental |
| Court Martial Order | Governmental |
| Commodore's Messenger Organization | Governmental |
| Check Me Out | Internet |
| Chief Media Officer | Jobs |
| Chief Medical Officer | Jobs |
| Chief Marketing Officer | Jobs |
| Career Medical Officer | Medical |
| Case Management Organization | Medical |
| Clinical Medical Officer | Medical |
| Competitive Medical Organisation | Medical |
| Cystoid Macular Oedema | Medical |
| Chief Medical Official | Medical |
| Contract Manufacturing Organizations | Medical |
| Center for Molecular Oncology | Medical |
| Central Masint (measurement and Signature Intelligence) Organization | Military and Defence |
| Chief Military Observer | Military and Defence |
| Civil-military Operations | Military and Defence |
| Collection Management Office | Military and Defence |
| Convoy Movement Order | Military and Defence |
| Contract Management Officer | Military and Defence |
| Collateralized Mortgage Obligation | Real Estate |
| Canadian Mathematical Olympiad | Regional |
| Chicago, St. Paul, Minneapolis and Omaha Railway (Union Pacific Railroad) | Regional |
| Central Merchandising Office | Regional |
| Configuration Management Office | Space Science |
| Central Money-markets Office | Stock Exchange |
| Obbia Airport | Transport & Travel |
