| Acronym | Definition |
|---|
| OPoP➣Original Proof of Purchase |
| OPoP➣Optimal Pregnancy Outcome Program (North Dakota Department of Health) |
| OPoP➣Old Post Office Pavilion (historic site; El Centro, CA) |
| OPoP➣Orange Power of the Past (farming exhibition) |
| OPoP➣One Price One Product (Media and Advertising) |
| OPoP➣One Plan, One Process (Treasury Board of Canada Secretariat) |
| OPoP➣Optical Pump-Optical Probe (spectroscopy) |