RSL

RSL may refer to:

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 Airmen's Imperial League of Australia (1940–1965)
- Returned Services League of Australia (1965–1990)

RAISE Specification Language, a formal approach to software development
RenderMan Shading Language, a language from the RenderMan Interface Specification used for writing shaders
Restricted Service Licence, British limited time low power radio or television broadcasting
Received Signal Level, signal strength of data transmitted via radio waves

Radcliffe Science Library, Oxford University
Raid: Shadow Legends, 2018 mobile game by Plarium Games
Recurrent slope lineae, surface features on Mars
Registered Social Landlord, a British independent public housing organization
Relative sea level, the distance from the ocean floor to its surface
Rennellese Sign Language, an extinct form of home sign documented from Rennell Island in 1974
Revolutionary Socialist League (disambiguation), the name of several political groups
Royal Society of Literature, the senior literary organisation in Britain
Russian Sign Language, a sign language used by the deaf community in Russia
Russian State Library, the national library of Russia