- ABC EntertainsCountry: AustraliaFounded: 2009
- ABC FamilyCountry: AustraliaFounded: 2005
- ABC iviewCountry: AustraliaFounded: July 24, 2008
- ABC KidsCountry: AustraliaFounded: 1989
- ABC KidsAnimated series: 3Format: program block
- ABC TelevisionCountry: AustraliaFounded: 2008
- Adult SwimCountry: United StatesFounded: September 1, 1999
- AjyalCountry: Saudi ArabiaFounded: September 20, 2009
- All-Nippon News NetworkCountry: JapanFounded: January 1, 1970
- Amazon FreeveeFounded: January 11, 2019Animated series: 1
- Amazon Prime VideoCountry: United StatesFounded: September 7, 2006
- AMCCountry: United StatesFounded: October 1, 1984
- AMC+Animated series: 2Format: brand, video streaming service
- American Broadcasting CompanyCountry: United StatesFounded: May 15, 1943
- ANIBOXAnimated series: 1Format: television channel
- Animal PlanetCountry: United StatesFounded: October 1, 1996
- Animation Digital NetworkCountry: FranceFounded: September 2013
- AnimaxCountry: JapanFounded: May 20, 1998
- AnimeFestaCountry: JapanFounded: May 10, 2021
- ANIPLUSCountry: South KoreaFounded: September 10, 2004
- ANS TVCountry: AzerbaijanFounded: 1991
- ANT1Country: Greece, CyprusFounded: 1989
- Antena 3Country: SpainFounded: December 25, 1989
- Antena 7Country: Dominican RepublicFounded: 1999
- Antenne 2Country: FranceFounded: January 1, 1975
- Apple TVCountry: United StatesFounded: November 1, 2019
- ARB GünəşCountry: AzerbaijanFounded: April 1, 2015
- ArteCountry: France, GermanyAnimated series: 2
- Asahi Broadcasting Group HoldingsCountry: JapanFounded: March 15, 1951
- Asahi Television Broadcasting CorporationCountry: JapanFounded: April 5, 2017
- Astro PrimaCountry: MalaysiaFounded: 2003
- Astro RiaCountry: MalaysiaFounded: June 1, 1996
- AT-XCountry: JapanFounded: 2000
- Atom.comFounded: 1998Animated series: 1
- Australian Broadcasting CorporationCountry: AustraliaFounded: July 1, 1932
- Auvio Kids TVCountry: BelgiumAnimated series: 1
- AVROCountry: NetherlandsFounded: 1923
- À PuntCountry: SpainFounded: April 25, 2018