| Abbreviation | Definition |
|---|---|
| COE | Clean Our Earth |
| COE | Corps Of Engineers |
| COEM | Center for Occupational and Environmental Medicine |
| COEM | Center for Occupational Environmental Medicine |
| COEN | Center for Occupational and Environmental Neurology |
| COH | Coefficient Of Haze |
| COLO | Colonial National Historical Park |
| COMBIC | Combined Obscuration Model for Battlefield Induced Contaminants |
| COOL | Clean Our Okanagan Lake |
| COP | Conference Of the Parties |
| COP | Conservator Of Petroleum |
| CORR | Chemicals On Reporting Rules |
| COSHET | Center Of Occupational Safety Health And Environmental Technology |
| COSHH | Control Of Substances Hazardous to Health |
| COWR | Curbside Organic Waste Recycling |
| COWRA | Connecticut Onsite Wastewater Recycling Association |
| CP | Cleaner Production |
| CPA | Common Agricultural Policy |
| CPAK | Community Pesticide Action Kit |
| CPCB | Central Pollution Consistent Board |