| Acronym | Definition |
|---|
| RSA | Republic of South Africa |
| RSA | Rivest, Shamir, & Adleman (public key encryption technology) |
| RSA | Rehabilitation Services Administration |
| RSA | Revenu de Solidarité Active (French social welfare system) |
| RSA | Royal Society for the Encouragement of Arts, Manufactures and Commerce |
| RSA | Renaissance Society of America |
| RSA | Retirement Systems of Alabama |
| RSA | Royal & Sun Alliance |
| RSA | Retirement Savings Account |
| RSA | Royal Scottish Academy (Edinburgh) |
| RSA | Rational Software Architect |
| RSA | Respiratory Sinus Arrhythmia |
| RSA | Residenze Sanitarie Assistenziali (Italian: Social Care Residences) |
| RSA | Regional Studies Association (UK) |
| RSA | Research Society on Alcoholism |
| RSA | Remote Supervisor Adapter |
| RSA | Road Safety Audit |
| RSA | Revised Statutes Annotated (laws of the state of NH) |
| RSA | Rural Service Area |
| RSA | Resident Student Association |
| RSA | Runway Safety Area |
| RSA | Russian Space Agency |
| RSA | Redstone Arsenal |
| RSA | Rhetoric Society of America |
| RSA | Returned Services Association (New Zealand; established 1916) |
| RSA | Republiek van Suid-Afrika (Republic of South Africa) |
| RSA | Responsible Serving of Alcohol |
| RSA | Rent Stabilization Association (New York City, NY) |
| RSA | Rear Seat Audio (General Motors) |
| RSA | Radiostereometric Analysis (x-ray technique) |
| RSA | Royal Society of the Arts |
| RSA | Radioactive Substances Act |
| RSA | Road-Side Assistance |
| RSA | Random Sequential Adsorption |
| RSA | Revenue Sharing Agreement |
| RSA | Revised Statutes of Alberta (Canada) |
| RSA | Royal Signals Association (UK) |
| RSA | Response Spectrum Analysis |
| RSA | Robotics Society of America |
| RSA | Remote Secure Access |
| RSA | Rhythmic Slow Activity |
| RSA | Rett Syndrome Association |
| RSA | Santa Rosa, La Pampa, Argentina (Airport Code) |
| RSA | Reusable Software Assets |
| RSA | Riverside Sheriff's Association |
| RSA | Rural Statistical Area |
| RSA | Repair Service Answering (module) |
| RSA | ROPME Sea Area (Arabian/Persian Gulf) |
| RSA | Receptive Services Association |
| RSA | Rate Sensor Assembly |
| RSA | Random Sequential Addition |
| RSA | Repair Service Attendant |
| RSA | Related Scientific Activity (Canada) |
| RSA | Range Standardization & Automation |
| RSA | Regional Support Activity |
| RSA | Regimental Support Area |
| RSA | Remote Storage Area |
| RSA | Relative Standardabweichung |
| RSA | Resource Staging Area (emergency management) |
| RSA | Rolled Steel Angle (Steel Construction Industry) |
| RSA | Right Shift Algorithm |
| RSA | retrograde storage area (US DoD) |
| RSA | Radio Set Adapter (CSEL) |
| RSA | Route Schedule Adherence (telematics) |
| RSA | Radar Signature Analysis |
| RSA | Red Squad Alliance (gaming clan) |
| RSA | Block-Repeat Start Address Register |
| RSA | Real Sector Access |
| RSA | Reformed Saiyajin Army (RPG gaming community) |
| RSA | Resource Support Associates, Inc. (consultants) |
| RSA | Roller Sports Australia Inc. |
| RSA | Remote Storage Activities |
| RSA | Rear Support Area |
| RSA | Red Sun Army (gaming clan) |
| RSA | Receiver Splitter Amplifier (splits one antenna into multiple receivers in radio systems) |
| RSA | Red Star Army (band) |
| RSA | Rapid Simulation Aids |
| RSA | Radio Spectrum Agency (UK) |
| RSA | Range Scaling Algorithm |
| RSA | Radial Slot Antenna |
| RSA | Registry Service Agreement |
| RSA | Replication System Administrator |
| RSA | Research Planning and Assessment |
| RSA | Remote Signal Activation |
| RSA | Route Setting Agent (UK railways) |
| RSA | Reconfigurable Slot Antenna |
| RSA | Random Sound Archive (website) |
| RSA | Repairable Sub Assembly |
| RSA | Rotationally Symmetric Antenna |
| RSA | Reflex Sympathetic Atrophy |
| RSA | Road Side Accident |
| RSA | Restricted Service Account (structured query language mail) |
| RSA | Reacquisition Search Area (US Navy) |
| RSA | Randon Structures and Algorithms (journal) |
| RSA | Research Subject Advocacy (various schools) |
| RSA | Recreational Sea Angling (fishing; UK) |