| Acronym | Definition |
|---|
| RSSO➣Radiation Safety Staff Officer |
| RSSO➣Russian State Symphony Orchestra |
| RSSO➣Ruchika Social Service Organization (India) |
| RSSO➣Rabbinical School Student Organization |
| RSSO➣Ravenna Second String Orchestra |
| RSSO➣Rettungs Schwimm Sport Organisation (German: Rescue Swimming Sports Organization) |
| RSSO➣Registered Stock and Securities Ordinance (Sri Lanka) |