M
- Mediahuis NRC B.V.
- Mediahuis nv (Belgium)
- Mediahuset Svea AB
- Medialivre, S.A.
- Medialogia
- Medialyd
- Mediamax Network Limited
- MediaNews Group Inc (USA)
- Mediaprint Z&Z Verlag GmbH & Co KG
- Mediaprint Zeitungs-und Zeitschriftenverlag
- Mediaquest Corp
- Mediarey Hungary Services Zrt.
- MediaSeven
- Mediatoday Co Ltd
- Mediaworks Regionalis Kiadoi Kft
- Meditation and Health
- Medya Tablet
- MEDYA YAYIMCILIK VE REKLAMCILIK ANONIM SIRKETI
- Mega Global Licensing Inc
- Mega Media
- Melia Hotels (Spain)
- Menopause Matters
- Mens Arena
- Mercedes Benz Australia
- Meridian Media
- Methode Media
- Metro Daily Hong Kong
- Metro International
- Metro Montreal
- Metro Newspapers
- Metro Seoul
- Metro Sweden
- Metroland Media Group Ltd.
- Metropole (Austria)
- Metropole Var
- Metropolis
- MG Agnesi Training SL
- Mgallery and Sofitel Hotels
- Mi Marathi
- Midi Olympique
- Mile High Media
- Milenio
- Miles Marketing Destinations
- Miles Media Pte Ltd
- Milestone Magazine
- Milk
- Millionaire Magazine srl
- Millivres Prowler Group
- Milliyet
- Milwaukee Magazine