| Abbreviation | Definition |
|---|---|
| RS | Running System |
| RSA | Raleigh Swimming Association |
| RSA | Rate Stabilization Account |
| RSA | Reading Sufficiency Act |
| RSA | Real Sex Addicted |
| RSA | Really Sweet Activities |
| RSA | REALTOR® Senior Advisor |
| RSA | Regional Studies Association |
| RSA | Registrar Staging Assistant |
| RSA | Registration Services Agreement |
| RSA | Rehabilitation |
| RSA | Rehabilitation Services |
| RSA | Rehabilitative Services Administration |
| RSA | Republic of Sex Addicts |
| RSA | Responsible Service of Alcohol |
| RSA | Restricted Security Area |
| RSA | Retirement Systems of Alabama |
| RSA | Revised Shapley Ames |
| RSA | Rhetoric Society of America |
| RSA | Rivest Shamir Adelman |