- BabyBus - Nursery RhymesAnimated series: 1Format: website, YouTube channel
- BabyTVCountry: United KingdomFounded: 2003
- BandCountry: BrazilFounded: May 13, 1967
- BBC Children's and EducationCountry: United KingdomAnimated series: 18
- BBC KidsCountry: CanadaFounded: November 5, 2001
- BBC OneCountry: United KingdomFounded: November 2, 1936
- BBC TwoCountry: United KingdomFounded: April 20, 1964
- Beijing Radio & Television StationCountry: People's Republic of ChinaFounded: 1979
- BentkeyCountry: United StatesFounded: October 16, 2023
- BETCountry: United StatesFounded: 1980
- BilibiliCountry: People's Republic of ChinaFounded: June 26, 2009
- BipCountry: IsraelFounded: 2000
- BlackpillsCountry: FranceFounded: May 5, 2017
- Bohbot Kids NetworkFounded: November 19, 1985Animated series: 1
- BoingCountry: ItalyFounded: 2004
- BoomerangCountry: United StatesFounded: December 8, 1992
- BoomerangCountry: Brazil, Latin AmericaFounded: July 1, 2001
- BoomerangFounded: 2000Animated series: 1
- British Broadcasting Company LimitedCountry: United Kingdom of Great Britain and IrelandFounded: October 18, 1922
- British Broadcasting CorporationCountry: United KingdomFounded: January 1, 1927
- Broadcast syndicationAnimated series: 126Format: economic activity
- BS AsahiCountry: JapanFounded: December 17, 1998
- BS FujiCountry: JapanFounded: December 15, 1998
- BS TV TokyoCountry: JapanFounded: December 14, 1998
- BS-TBSCountry: JapanFounded: 1998
- BS11Country: JapanAnimated series: 2