| Acronym | Definition |
|---|
| FOSR➣Friends of Saint Roch |
| FOSR➣Friends of the Shenandoah River (Winchester, VA) |
| FOSR➣First Opinions, Second Reactions (Purdue University Press; West Lafayette, IN) |
| FOSR➣Flexible Optical Solar Reflector |
| FOSR➣Front of Store Recycling (UK) |
| FOSR➣Friends of the Shiawassee River (Owosso, MI) |
| FOSR➣Friends of the Scioto River (Ohio) |
| FOSR➣Friends of Soviet Russia (est. 1921) |