| Acronym | Definition |
|---|
| OPEI➣Office of Policy, Economics and Innovation (US EPA) |
| OPEI➣Outdoor Power Equipment Institute, Inc. |
| OPEI➣Office of Public Education and Interpretation (African Burial Ground; New York, NY) |
| OPEI➣Order of Prince Edward Island (Canada) |
| OPEI➣Operational Programme Enterprise and Innovations (conference) |
| OPEI➣Office of Prevention and Early Intervention (Delaware) |