| Abbreviation | Definition |
|---|---|
| RUSU | Reading University Students' Union |
| RUSU | RMIT University Student Union |
| RUSU | RMIT University Students Union |
| RUTI | Russian Union of Travel Industry |
| RUW | Rinder Union West |
| RVP | Regional Vice President |
| RWT | Reduction of Working Time |
| RYOT | Rallying Youth Organizers Together |
| RYOT | Revolutionary Youth of Today |
| SABTU | South Africa Business Trade Union |
| SABU | South Australian Baptist Union |
| SACTU | South African Congress of Trade Unions |
| SACTU | South African Council of Trade Unions |
| SACU | San Antonio Credit Union |
| SACU | Sheboygan Area Credit Union |
| SACU | South Africa Customs Union |
| SACU | Southern Africa Customs Union |
| SACU | Southern African Customs Union |
| SACWU | South African Chemical Workers Union |
| SADNU | South African Democratic Nurses Union |