SL or sl may stand for:
San Leandro, California
Super League
Rio Sul Serviços Aéreos Regionais IATA code
Southern League (baseball), a Class AA league in Minor League Baseball
The complexity class SL; see SL (complexity)
SL Corporation, a Korea's auto parts company
Sierra Leone, ISO country code
Suburban Legends, ska band based in Orange County, California.
Slovenian language (ISO 639)
The Mercedes-Benz SL an automobile
sea level
Standard Level, a level of course difficulty in the International Baccalaureate Diploma Programme
sine loco, used in bibliographies to indicate that the place of publication of a document is unknown
Serjeant-at-law, an obsolete legal position in the United Kingdom
special linear group, a group of matrices
Second Life, a massively multi-user 3D virtual world oriented towards 3D content creation.
Sri Lanka, a country
Storstockholms Lokaltrafik, public transport operator in Stockholm
Stronnictwo Ludowe, a defunct Polish party
Starex Limousine, technical by StarCraft Van royalty, a car built by Hyundai Motor Company.
ScoutLink IRC ScoutLink IRC - an International Chat Network for Scouts and Guides.
superlattice
Sentential logic
Sexy Losers, a webcomic
Sendero Luminoso, the "Shining Path" Maoist guerrilla movement
Statue of Liberty
Steve Lukather, an American guitarist
Sensei's Library, a wiki containing a wealth of knowledge about the game of Go.
Stereolithography, a method of solid freeform fabrication or layered manufacturing using UV-curable photopolymer.
http://en.wikipedia.org/wiki/SL