| Acronym | Definition |
|---|
| RSU | Responsabilidad Social Universitaria (Spanish: University Social Responsibility) |
| RSU | Rogers State University (Claremore, Oklahoma) |
| RSU | Restricted Stock Unit |
| RSU | Rating Service Unit (Germany) |
| RSU | Rifiuti Solidi Urbani (Italiano) |
| RSU | Regional School Unit (Maine) |
| RSU | Rappresentanza Sindacale Unitaria (Italian Group of Unions) |
| RSU | Road Safety Unit (various locations) |
| RSU | Remote Service Unit (various locations) |
| RSU | Remote Switching Unit |
| RSU | Riga Stradins University (Riga, Latvia) |
| RSU | Red State Update |
| RSU | Regional Support Unit |
| RSU | Rutgers, the State University |
| RSU | Remote Sensing Unit |
| RSU | Recommended Service Upgrade (IBM mainframe software management) |
| RSU | Rear Support Unit (US DoD) |
| RSU | Remote Subscriber Unit (converts CATV frequencies to phone service) |
| RSU | Repair Service & Upgrade (Australia) |
| RSU | Response Support Unit (US VA) |
| RSU | Rapid Support Unit (US DoD) |
| RSU | Runway Supervisory Unit |
| RSU | Rate Sensor Unit |
| RSU | Yosu, South Korea - Yosu Airport (Airport Code) |
| RSU | rec.sport.unicycling (newsgroup) |
| RSU | Recuperative Services Unit (various organizations) |
| RSU | Ruggedized Service Unit (C-130 aircraft) |
| RSU | Reunification Services Unit (US FEMA) |
| RSU | Recovery Support Unit (UK) |
| RSU | Residuos Sólido Urbanos (Spanish) |
| RSU | Responsabilité Sociale des Universités (French: Social Responsibility of Universities) |
| RSU | Remote Set Up |
| RSU | Redundancy Switch Unit |
| RSU | Roller Suspension Unit |
| RSU | Railway Services Unit |
| RSU | Relay Storage Unit |
| RSU | Runescape Unlocked (gaming) |
| RSU | Recorder Switch Unit |
| RSU | Receiver Synthesizer Unit |
| RSU | Rating Scale Unit |
| RSU | Remote Storage Unit |
| RSU | Rescue Support Umbilical |