| Acronym | Definition |
|---|
| OCO➣Office of Community Outreach (various schools) |
| OCO➣Orbiting Carbon Observatory |
| OCO➣Old Cornish (linguistics) |
| OCO➣Oracle Connector for Outlook |
| OCO➣Overseas Contingency Operations |
| OCO➣Open-Close-Open |
| OCO➣Object Code Only |
| OCO➣Organic Certification Organization (organic foods; Japan) |
| OCO➣Ostrobothnian Chamber Orchestra (Finland) |
| OCO➣Office of Climate Observation (NOAA) |
| OCO➣Operating Capital Outlay |
| OCO➣Offensive Cyberspace Operation |
| OCO➣Online Channel Optimization |
| OCO➣Orange County Open (golf tournament; California) |
| OCO➣Oort Cloud Object |
| OCO➣Office of Central Operations |
| OCO➣Overall Control Office |
| OCO➣One Cancels the Order (banking, foreign exchange) |
| OCO➣Operational Contracting Officer |
| OCO➣Office of Civilian Operations |
| OCO➣Off-Load Control Officer |
| OCO➣Operating and Control Organization |
| OCO➣Operational Capabilities Objective |
| OCO➣Office, Chief Ordnance |
| OCO➣Oklahoma Community Orchestra |
| OCO➣Office of the Credit Ombudsman |
| OCO➣Oahu Civic Orchestra (Hawaii) |
| OCO➣Olathe Community Orchestra (Olathe, KS) |
| OCO➣Oakland Civic Orchestra (Oakland, CA) |
| OCO➣Optimal Cycle Ordering |