- M6Country: FranceFounded: March 1, 1987
- Magyar TelevízióCountry: HungaryFounded: May 1, 1957
- Malyatko TVCountry: UkraineAnimated series: 1
- MamaCountry: RussiaFounded: September 17, 2007
- MangasCountry: FranceFounded: 1996
- Mango TVCountry: People's Republic of ChinaFounded: 2006
- MBC 1Country: Saudi Arabia, United Arab EmiratesFounded: 1991
- MBC 2Country: Saudi ArabiaFounded: 2004
- MBC TVCountry: South KoreaAnimated series: 22
- MBSCountry: JapanFounded: July 28, 2016
- MBS TVCountry: JapanFounded: 1959
- MediaCorp Channel 5Country: SingaporeFounded: 1963
- MediaCorp SuriaCountry: SingaporeFounded: 1984
- Mega TVCountry: United StatesFounded: 2006
- MGM TelevisionCountry: United StatesFounded: 1956
- Milkshake!Animated series: 3Format: program block
- MinimaxCountry: Hungary, RomaniaFounded: 1994
- MirCountry: RussiaFounded: September 1, 2003
- MNCTVCountry: IndonesiaFounded: 1991
- Mondo MediaCountry: United StatesFounded: 1988
- MTVCountry: United StatesFounded: August 1, 1981
- MTV2Country: United StatesFounded: August 1, 1996
- MTV2Country: CanadaFounded: October 18, 2001
- MTV3Country: FinlandFounded: August 13, 1957
- MultCountry: RussiaFounded: 2014
- MultishowCountry: BrazilFounded: 1991
- Munhwa Broadcasting CorporationCountry: South KoreaFounded: February 21, 1961
- Music 24Country: IsraelFounded: July 20, 2003
- MyxCountry: United StatesFounded: 2007