| Acronym | Definition |
|---|
| RSL | Real Salt Lake (soccer club; Utah) |
| RSL | Registered Social Landlord (UK) |
| RSL | Robert Sean Leonard (actor) |
| RSL | Returned and Services League (Australia) |
| RSL | Recurring Slope Lineae (astronomy) |
| RSL | Rugby Super League |
| RSL | Russian State Library (Moscow, Russia) |
| RSL | Read and Set Lock |
| RSL | Recommended Spares List |
| RSL | Request and Status Link |
| RSL | Roots Surname List |
| RSL | Resource Specification Language |
| RSL | Ringer Sound Level |
| RSL | Registry Size Limit |
| RSL | Relay Stop List |
| RSL | Resource Management Layer |
| RSL | Raising the Standard of Living |
| RSL | Religious and Spiritual Life (various locations) |
| RSL | Returned & Services League of Australia (formerly Returned Services League of Australia; est. 1916) |
| RSL | registry size limit (Microsoft Windows) |
| RSL | Remote Sensing Laboratory |
| RSL | Rygge Sivile Lufthavn (Norwegian civilian airport) |
| RSL | Relative Sea Level |
| RSL | Runtime Shared Library |
| RSL | Renderman Shading Language |
| RSL | RAISE Specification Language |
| RSL | Received Signal Level |
| RSL | Regina Shipping Lines (Philippines) |
| RSL | Restricted Service License (radio) |
| RSL | Republic of Sierra Leone |
| RSL | Reserve Static Line |
| RSL | Rethinking School Lunch |
| RSL | Recovery Service Level (risk management) |
| RSL | Royal Society of London (scientific academy; London, England, UK) |
| RSL | Radio Station License (various locations) |
| RSL | Revolutionary Socialist League (British Trotskyist Group) |
| RSL | Rofin-Sinar Laser (Germany) |
| RSL | Real Soon Now |
| RSL | Rambus Signaling Level |
| RSL | Reusable Sanitary Landfill |
| RSL | Robot Scripting Language |
| RSL | Robotic Systems Laboratory (Santa Clara University; Santa Clara, CA) |
| RSL | Requirements Specification Language |
| RSL | Regional Screening Level (US EPA) |
| RSL | Reusable Software Library |
| RSL | Recommended Standard List (US FEMA) |
| RSL | Regional Stocking Location (various organizations) |
| RSL | Requirements Statement Language |
| RSL | Ruwa Sped Ltd. (Switzerland) |
| RSL | Rising Step Load |
| RSL | Remote SPRINT Launch |
| RSL | Radar Software Library (US NASA) |
| RSL | Radiological Society of Louisiana |
| RSL | Relative Strength Levy |
| RSL | Ready Service Locker(s) |
| RSL | Request and Status Links (telephony) |
| RSL | Reference System Lab |
| RSL | Research Status Log |
| RSL | Rhône-Saône et Loire (French railway company) |
| RSL | Redneck as Second Language |
| RSL | Representative Stim Latch |
| RSL | Returned Soldiers League/Legion |
| RSL | Rail Safety Law |
| RSL | Roof Switch Lock Module |
| RSL | Responsible Server List (Compaq) |
| RSL | Right Subscapular Line |
| RSL | Resalab Scientific Library |
| RSL | RoboCupRescue Simulation League |