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- Arthur McIntyre, Australian artist.
- Kristy McNichol, actress. The former child star and teen idol left the show Empty Nest due to her battle with the depression. McNichol later returned to the show for a few episodes during the series' last season.
- Burgess Meredith, actor; with cyclothymia (milder bipolar disorder).
- Eric Millegan, actor, played Zack Addy on Bones. In 2009, Millegan released a YouTube video of how being bipolar affects his life. He has rapid-cycling bipolar disorder.
- Kate Millett, author, The Loony-Bin Trip (1990) discusses her diagnosis of bipolar disorder, describing experiences with hospitalization and her decision to discontinue lithium therapy.
- Spike Milligan, comedian.
- Ben Moody, musician. The former guitarist from Evanescence.
- Seaneen Molloy, Northern Irish blogger.
- John A. Mulheren, American financier, stock and option trader and philanthropist.
- Edvard Munch, artist.
- Robert Munsch, author.
Read more about this topic: List Of People With Bipolar Disorder