RUO
| Acronym | Definition |
|---|---|
| RUO | Research Use Only |
| RUO | Resident Unit Officer |
| RUO | Reference Unbundling Offer |
| RUO | Reflection for UNIX and OpenVMS (Virtual Memory System) |
| RUO | Radikal Ungdom Odense (Danish: Radical Youth Odense; Denmark) |
| RUO | Run Ultima Online (emulator program) |
| RUO | Residual Urine Output |