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| Acronym | Acronym Meaning | Additional Information |
|---|---|---|
| O&M | Operations and Maintenance | |
| O&M | Operation and Maintenance | |
| O/O | Owner/Operator | |
| O3 | Ozone | |
| OAM | Office of Air Management (IDEM) | |
| OAQ | Office of Air Quality (IDEM) | |
| OBDII | On-Board Diagnostic Testing | |
| OCCT | Optimal Corrosion Control Treatment | |
| OCCTR | Optimal Corrosion Control Treatment Recommendation | |
| OCD | Offshore and Coastal Dispersion | |
| OD | Open Dump | |
| OD | Outside Diameter | |
| ODP | Ozone-Depleting Potential | |
| ODS | Ozone-Depleting Substances | |
| OE | Office of Enforcement (IDEM) | |
| OEA | Office of Environmental Adjudication (OEA) | |
| OEA | Office of External Affairs (IDEM) | |
| OECA | Office of Enforcement and Compliance Assurance | |
| OECD | Organization for Economic Cooperation and Development | |
| OEI | Office of Environmental Investigations (IDEM) | |
| OER | Office of Environmental Response (IDEM) | |
| OF | Optional Form | |
| OLC | Office of Legal Council (IDEM) | |
| OLQ | Office of Land Quality (IDEM) | |
| OLTS | On Line Tracking System | |
| OMBA | Office of Management, Budget, and Administration (IDEM) | |
| OPA | Office of Planning and Assessment | |
| OPA | Oil Pollution Act | |
| OPPP | Office of Public Policy and Planning | |
| OPPTA | Office of Pollution Prevention and Technical Assistance (IDEM) | |
| ORC | Oxygen Release Compound | |
| ORM | Other Regulated Material | |
| ORP | Oxidation-Reduction Potential | |
| ORSANCO | Ohio River Sanitation Commission | |
| OSC | On-scene Site Coordinator | |
| OSHA | Occupational Health and Safety Administration | |
| OSHWM | Office of Solid and Hazardous Waste Management (IDEM) | |
| OSM | Office of Surface Mining (Federal) | |
| OSN | On-Site Notifier | |
| OSRW | Outstanding State Resource Water | |
| OSWER | Office of Solid Waste and Emergency Response | |
| OT | Overtime | |
| OTAG | Ozone Transport Assessment Group | |
| OTC | Ozone Transport Commission | |
| OTR | Ozone Transport Region | |
| OVC | Office of Voluntary Compliance (IDEM) | |
| OWM | Office of Water Management (IDEM) | |
| OWQ | Office of Water Quality (IDEM) |
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