| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| OPG | Osteoprotegrin | In German | → Biochemistry, biophysics | 
| OPG | Objectif Projet Groupe | In French | → Management | 
| ÖPG | Österreichische Physikalische Gesellschaft (www.oepg.at) | In German | → Organizations and associations → Physics → Austria  |