STL may refer to:
Organisations
- Council for Religious and Life Stance Communities (Samarbeidsrådet for Tros- og Livssynssamfunn), Norway
- Send the Light, a British Christian book distributor
- Space Technology Laboratories, a former division of TRW Inc.
- Special Tribunal for Lebanon, an international criminal tribunal
- Standard Telecommunication Laboratories, a former UK research centre for Standard Telephones and Cables
Places
- St. Louis, Missouri, US
- St. Louis Cardinals, the city's Major League Baseball team
- St. Louis Blues, the city’s National Hockey League team
- St. Louis Lambert International Airport (IATA airport code: STL)
- Saint Lucia (UNDP country code)
Science and technology
- Studio transmitter link, of a radio or television station
- Spurious trip level, of a safety or alarm system
Computing
- Standard Template Library, originally for the C++ programming language
- .stl, a file format for subtitles
- STL (file format), a file format for 3D CAD models
- Statement List, programming language for Siemens SIMATIC S7
Transportation
- Société de transport de Laval, public transit in Laval, QC, Canada
- Société de transport de Lévis, public transit in Lévis, QC, Canada
- Southall railway station (National Rail station code: STL)
Other uses
- Stella Mwangi (born 1986), Norwegian-Kenyan singer also known as STL
- Licentiate of Sacred Theology (Sacrae Theologiae Licentiatus), a degree in Catholic religious studies
- Suara Timor Lorosae, a newspaper in East Timor
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