M
- M2M
- Madonna
- M (Sire/Warner Bros.) (US & Canada)
- Madhouse (Paisley Park/Warner Bros.)
- The Maine
- Major Figgas (Ruffnation/Warner Bros.)
- Miriam Makeba
- Malo
- Howie Mandel
- Manfred Mann's Earth Band (US & Canada)
- Marley Marl (Cold Chillin'/Warner Bros.)
- The Marketts
- Randy Marr
- Steve Martin
- Martini Ranch (Sire/Warner Bros.)
- Curtis Mayfield
- Lyle Mays
- Mazarati (Paisley Park/Warner Bros.)
- M.C. Shan (Cold Chillin'/Warner Bros.)
- Mac McAnally (Warner Bros. Nashville)
- Lila McCann (Warner Bros. Nashville)
- The McCarters (Warner Bros. Nashville)
- Neal McCoy (Warner Bros. Nashville)
- Michael McDonald
- Kate and Anna McGarrigle
- Maureen McGovern
- Lori McKenna (Warner Bros. Nashville)
- Loreena McKennitt
- Rod McKuen
- Christine McVie
- Meg & Dia (Doghouse/Warner Bros.)
- Brad Mehldau
- Tim Mensy (Giant/Warner Bros.)
- Mephisto Odyssey
- Mest (Maverick/Warner Bros.)
- Metallica (US & Canada)
- Pat Metheny
- Hilly Michaels
- Georgia Middleman (Giant/Warner Bros.)
- Bette Midler
- The Mighty Lemon Drops (Sire/Warner Bros.)
- Dennis Miller
- Lance Miller
- Ministry
- Robert Mirabal
- Adam Mitchell
- Chad Mitchell
- Modern Jazz Quartet
- Moloko (Echo/Warner Bros.)
- Monie Love
- John Michael Montgomery (Warner Bros. Nashville)
- Billy Montana (Warner Bros. Nashville)
- Montrose
- Van Morrison
- M.O.T. (Sire/Warner Bros.)
- Mr. Bungle
- Maria Muldaur
- My Bloody Valentine (Sire/Warner Bros.)
Read more about this topic: List Of Former Warner Bros. Records Artists