FOSR
| 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) |