| Acronym | Meaning |
| RSS | National News Agency (Nepal) |
| RSS | Radar Signal Simulator |
| RSS | Radar Support System |
| RSS | Radio Security Service (UK) |
| RSS | Radio Standards Specifications (Canada) |
| RSS | Rail Security Service |
| RSS | Range & Synchronization Subsystem |
| RSS | Range Safety Simulation |
| RSS | Range Safety System (US NASA) |
| RSS | Reactor Safety Study |
| RSS | Ready Service Spare |
| RSS | Recall Sensor/Store System |
| RSS | Receipt, Store and Stage (bioterrorism response) |
| RSS | Recruiting Substation |
| RSS | Refugee Social Services (various organizations) |
| RSS | Regimental Support Squadron |
| RSS | Regional Spatial Strategy (UK) |
| RSS | Regional Supply Squadron |
| RSS | Regional Surveillance System (VSS) |
| RSS | Reinforced Soil Slope (construction) |
| RSS | Remote Safing Switch |
| RSS | Remote Satellite Simulation |
| RSS | Remote Sensor System (US Army; aka REMBASS) |
| RSS | Remote Service System |
| RSS | Remote Site Subsystem/System |
| RSS | Remote Slave Station |
| RSS | Remote Supervisory Station |
| RSS | Repubbliche Socialiste Sovietiche (Italian: Soviet Socialist Republics) |
| RSS | Republic of Singapore Ship |
| RSS | Request for Supplies and Services |
| RSS | Requirement Spread Sheet |
| RSS | Rescue Swimmer School (Navy and Marine Corps) |
| RSS | Resident Satisfaction Survey (various locations) |
| RSS | Resident Site Supervisor |
| RSS | Resources Status Review |
| RSS | Rosette Scan Seeker |
| RSS | Rotating Shadowband Spectroradiometer |