RSL may refer to:
- In arts and entertainment
- Royal Society of Literature, the senior literary organisation in Britain
- In military
- Reserve Static Line, in skydiving
- Returned and Services League of Australia, current name (since 1990) of a defence forces veterans organisation
- Returned Sailors and Soldiers Imperial League of Australia (1916-1940)
- Returned Sailors' Soldiers' and Airmens Imperial League of Australia (1940-1965)
- Returned Services League of Australia (1965-1990)
- In music
- Random Spirit Lover, an album by Canadian indie rock band Sunset Rubdown
- In sport
- Real Salt Lake, a US soccer club
- Reserve Static Line, in skydiving
- Rugby Super League (US), a rugby union organization
- Russian Super League, a now defunct hockey league in Russia
- Super League, a rugby league competition in UK and France, a.k.a. "Rugby Super League"
- In technology
- RAISE Specification Language, a formal approach to software development
- Received Signal Level, telecommunications
- RenderMan Shading Language, a language from the RenderMan Interface Specification used for writing shaders
- RAISE Specification Language, a specification language
- Restricted Service Licence, British limited time low power radio or television broadcasting
- In other
- Radcliffe Science Library, Oxford University
- Registered Social Landlord, a British independent public housing organisation
- Revolutionary Socialist League, the name of several groups
- Russian Sign Language, a sign language used by the deaf community in Russia