| Abbreviation | Definition |
|---|---|
| PWUFSD | Port Washington Union Free School District |
| PZAS | Polski Zwiazek Akrobatyki Sportowej (Polish: Polish Union of Akrobatyki Sports) |
| QCU | Queensland Council of Unions |
| QPAT | Quebec Provincial Association of Teachers |
| QRFU | Quebec Rugby Football Union |
| QRU | QLD Rugby Union |
| RAG | Raising And Giving) |
| RAHU | Renters And Housing Union |
| RAOU | Royal Australasian Ornithologists Union |
| RATAWU | Radio Television Theatre and Art Workers Union of Nigeria |
| RBTU | Rail Bus and Tram Union |
| RBU | Roma Bible Union |
| RBU | Russian Biathlon Union |
| RCTU | R C Trade Union |
| RCTU | Revenue and Customs Trade Union |
| RCTU | Revenue Customs Trade Union |
| RCTU | Revolutionary Council of Trade Unions |
| RCU | Robot Chicks Union |
| RCUV | Revised Chinese Union Version |
| RCWU | Relief Camp Workers' Union |