| Acronym | Definition |
|---|
| ERSA | European Regional Science Association |
| ERSA | Engineering of Reconfigurable Systems and Algorithms (conference) |
| ERSA | Employer Retirement Savings Account |
| ERSA | En Route Supplement Australia (aviation) |
| ERSA | External Resource Sharing Agreement |
| ERSA | Ernst Sachs |
| ERSA | Economic Research Southern Africa (National Treasury of South Africa) |
| ERSA | Equity Release Solicitors Alliance |
| ERSA | Electronic Research Supply Agency (US Navy) |
| ERSA | Employee Retirement Savings Account |
| ERSA | Emergency Roadside Assistance |
| ERSA | Extended Runway Safety Area |
| ERSA | Eric Sadek (founder of ERSA Group) |
| ERSA | Enhanced Regional Situational Awareness |
| ERSA | Equal Resource-Sharing Allocation |
| ERSA | Estudios de la Realidad Social Argentina (high-school subject in Argentina) |