Publishers
Every publisher in the catalog, from the majors to single-book imprints.
- Martin Lemm
- Martin and Reid Ltd.
- Martini Comics
- Martyr Press
- Marvel
- Marvel Africa
- Marvel UK
- Marvel; American Entertainment
- Marvel; Crusade
- Marvel; DC
- Marvel; Gareb Shamus Enterprises [Wizard Entertainment]
- Marvel; Wizard
- Marx
- Marx; Philmar; P.M. Productions; Amex; Bairns
- Mary Fleener
- Mary Smith
- Mary Wings
- Maryland Civil Defense Agency; the Federal Civil Defense Administration
- Mascot Label Group
- Mass Casualty Comics LLC
- Mass Productions
- Massachusetts Division of Marine Fisheries
- Massachusetts United Labor
- Massive
- Massive Comics Group
- Master Comics
- Master Comics
- Master Publications
- Master's Way Comics
- Mastergraphics Studio
- Mastermind Comics
- Masterpiece Comics
- Masterstroke Studios
- Matchless Books
- Matchlock Press
- Math Comics
- Matrix Graphic Series
- Mats!? [Mats Stromberg]
- Matt
- Matt Bors
- Matt Delight and Kevin Cross
- Matt Dembicki / Three Crows Press
- Matt Durand
- Matt Kindt
- Matt Wiegle
- Mattei Medien
- Mattel
- Mattel of Canada
- Matthew
- Matthew Warlick
- Mature Magic Publications
- Mauretania Comics
- Maurice Buckley
- Mavec's Comics
- Maverick Arts
- Maverick Arts Publishing
- Maverick Publications
- Maverick Studios
- Mawil
- Max C. Gaines
- Max Hopper
- Max North Alaska Comics
- Maximized Comics
- Maximum Press
- Maximum Press; Warrior Publications
- Maximum Press; Wizard
- Maximum Traffic
- May Fly Publications
- Mayamada
- Mayapuri Group
- Mayfair Publications
- Mayflower House
- Maynards
- Mayo Clinic Press
- McCall Corporation
- McCay Features Syndicate
- McClatchy Lifestyle Entertainment
- McClelland & Stewart
- McCombs
- McComics
- McCormick Press
- McCormick-Patterson
- McCrickrick
- McCrory's
- McDonald's Corporation
- McDonald's Corporation; DDB Kid Think
- McFarland & Co.
- McGarvey Coffee Company
- McGill-Queen's University Press
- McGraw-Hill
- McKenzie
- McLaughlin Bros.
- McLean
- McMann & Tate
- McMullen Museum of Art, Boston College
- McNaught Syndicate
- McNeil Entrepreneurs Inc.
- McSweeney's
- Meadowbrook
- Meanwhile Studios
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