- S4CCountry: Wales, United KingdomFounded: 1982
- Saint PetersburgCountry: RussiaFounded: October 10, 2010
- SBS TVCountry: South KoreaFounded: 1991
- Schweizer FernsehenCountry: SwitzerlandFounded: 1953
- Seoul Broadcasting SystemCountry: South KoreaFounded: November 14, 1990
- Seven NetworkCountry: AustraliaFounded: November 4, 1956
- Señal ColombiaCountry: ColombiaFounded: 1970
- Sharjah TVCountry: United Arab EmiratesAnimated series: 1
- ShowmaxCountry: South AfricaFounded: August 19, 2015
- ShowtimeCountry: United StatesFounded: July 1, 1976
- SIC KCountry: PortugalFounded: 2009
- Sistema Brasileiro de TelevisãoCountry: BrazilFounded: August 19, 1981
- Sky KidsAnimated series: 4Format: television channel
- Sky Sports F1Country: United KingdomFounded: 2012
- SkyChannelFounded: March 1, 2005Animated series: 1
- SonicCountry: IndiaFounded: 2011
- Soviet Central TelevisionCountry: Soviet UnionFounded: March 22, 1951
- Spike TVCountry: United StatesFounded: August 11, 2003
- SproutFounded: September 26, 2005Animated series: 1
- SproutCountry: United StatesFounded: September 26, 2005
- Star ChannelCountry: GreeceFounded: 1993
- Star TVCountry: Turkey, Azerbaijan, Northern CyprusFounded: 1990
- StarzCountry: United StatesFounded: February 1, 1994
- STSCountry: RussiaFounded: 1996
- STS KidsCountry: RussiaFounded: July 6, 2018
- Subbota!Country: RussiaFounded: December 15, 2017
- Sun TelevisionCountry: JapanFounded: 1969
- Super ChannelCountry: CanadaFounded: November 2, 2007
- Super RTLCountry: GermanyFounded: 1995
- Super ÉcranCountry: CanadaFounded: February 1, 1983
- Super!Country: ItalyFounded: 2010
- Sveriges TelevisionCountry: SwedenFounded: September 17, 1934
- SVT1Country: SwedenFounded: September 4, 1956
- SVT2Country: SwedenFounded: December 5, 1969
- SyfyCountry: United StatesFounded: September 24, 1992