| Abbreviation | Definition |
|---|---|
| RSL | Reason Season Lifetime |
| RSL | recurring slope lineae |
| RSL | Regional Screening Levels |
| RSL | Respect Survive and Loyalty |
| RSL | Restricted Service Licence |
| RSL | Restricted Substance List |
| RSL | Restricted Substances List |
| RSL | Restricted Substances Lists |
| RSL | Return Services League |
| RSL | Returned and Services League |
| RSL | Returned Services League |
| RSL | Ricardo Street Locos |
| RSL | Rochester Systems Ltd |
| RSL | RootsWeb Surname List |
| RSL | Rugby Super League |
| RSL | Ryan's Smashing Life |
| RSLC | Reconnaissance and Surveillance Leaders Course |
| RSLE | Remote Subscriber Line Equipment |
| RSLF | Retirement Savings Lost and Found |
| RSLF | Royal Saudi Land Forces |