Organizations
- Scarborough Town Centre
- Space Transport Corporation
- Student Transportation of Canada
- Saudi Telecom Company
- Semiconductor Test Consortium
- SHAPE Technical Centre
- Society for Technical Communication
- SeeBeyond Technology Corporation, originally Software Technology Corporation
- Cuban Workers' Solidarity or Solidaridad de Trabajadores Cubanos, a Cuban trade union
- Standard Telephones and Cables
- Standard Telephones and Cables F.C.
- STC Recordings, a record label
- Stewart Information Services Corporation, New York Stock Exchange Ticker symbol STC
- Sydney Theatre Company, leading theatre company, Sydney, Australia
- Sydney Turf Club, horse-racing administration, Sydney, Australia
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