FRSO
| Acronym | Definition |
|---|---|
| FRSO | Freedom Road Socialist Organization |
| FRSO | Frankfurt Radio Symphony Orchestra (Germany) |
| FRSO | Finnish Radio Symphony Orchestra (est. 1927) |
| FRSO | Fédération Régionale des Sports d'Orientation (South Belgium Orienteering Federation; French) |
| FRSO | Federal Relay Service Online (federal disability service) |
| FRSO | Ferret Rescue Society of Ottawa and Area (Ottawa, Canada) |