STL

• 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

• 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)

• Studio transmitter link, of a radio or television station
• Spurious trip level, of a safety or alarm system

• 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

• 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)
• Thousand Lights metro station (Chennai Metro station code: STL)

• Soviet Top League, defunct association football league of the Soviet Union
• Stella Mwangi (born 1986), Norwegian-Kenyan singer also known as STL
• Licentiate of Sacred Theology (Sacrae Theologiae Licentiatus), a degree in Catholic religious studies
• St. Thomas League, an association football league in US Virgin Islands
• Suara Timor Lorosae, a newspaper in East Timor

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