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- Taj Mahal (1979, 1993)
- The Maines Brothers Band (1985)
- Louise Mandrell (1986)
- The Manhattan Transfer (1998)
- Aimee Mann (2008)
- Joe Maphis (1984 "Legends")
- Rose Maphis (1984 "Legends")
- Damian "Junior Gong" Marley (2007)
- Jimmy Martin (1990 "Will The Circle Be Unbroken")
- Steve Martin (2010 with Sarah Jarosz)
- Will T. Massey (1992)
- Masters of Bluegrass (1991)
- Kathy Mattea (1987, 1990, 1993)
- Dave Matthews (2000 with Emmylou Harris)
- Dave Matthews Band (2009)
- The Mavericks (1995, 2000)
- John Mayall (1993)
- John Mayer (2003, 2007)
- Martina McBride (1999)
- McBride & The Ride (1991)
- Charly McClain (1982)
- Delbert McClinton (1977, 1979, 1983, 1989, 1993, 1996 with Asleep at the Wheel, 1997, 2001 "Big Blues Extravaganza" classic encore, 2002)
- Del McCoury Band (2001)
- Mel McDaniel (1986)
- Michael McDonald (2004)
- Reba McEntire (1988)
- John McEuen (1979)
- Roger McGuinn (1986)
- Sarah McLachlan (2009)
- Don McLean (1982)
- James McMurtry (1990, 2007)
- Natalie Merchant (2002)
- Tift Merritt (2006)
- Pat Metheny Group (2003)
- Augie Meyers (1976)
- Bill Miller (1995)
- Buddy Miller (2000 with Emmylou Harris)
- Julie Miller (2000 with Emmylou Harris)
- Roger Miller (1983, classic encores 1996, 1997 "Legends" classic encore)
- Malford Milligan (2001 with Double Trouble)
- Ronnie Milsap (1987)
- Richard Mirabal (1996 with Michael Martin Murphey)
- Waddie Mitchell (1991 "Salute to the Cowboy")
- Keb' Mo' (1996, 2001 solo & 2001 "Big Blues Extravaganza" classic encore)
- Bill Monroe (1981, 1986, 1997 classic encore & "Legends" classic encore)
- Tiny Moore (1981 "Mandolin Special")
- Allison Moorer (1997 with Lyle Lovett, 2001)
- Gary Morris (1984, 1986)
- Modest Mouse (2005)
- John Michael Montgomery (1994)
- Monte Montgomery (1999)
- Lorrie Morgan (1990)
- Gary Morris (1990)
- Van Morrison (2006)
- Cory Morrow (2003)
- Mother of Pearl (1978)
- Jason Mraz (2003)
- Oliver Mtukudzi (2002 with Bonnie Raitt)
- Michael Martin Murphey (1978, 1981, 1983, 1987, 1990 "Will The Circle Be Unbroken", 1991 "Salute to the Cowboy", 1996, 2000 with Lyle Lovett)
- Mumford & Sons (2011)
- Muse (2006)
- My Morning Jacket (2006, 2008)
Read more about this topic: List Of Austin City Limits Performers