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| Mademoiselle Marie |
Mad Hatter |
Mad Harriet |
Magpie |
Major Disaster |
Mala |
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| Malet Dasim |
Malochia |
Mammoth |
Man-Bat |
Manhunter robot |
Mantis |
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| March Hare |
Mark Moonrider |
Martian Manhunter |
Mary Marvel |
Marvin White |
Maxima |
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| Mera |
Mercury |
Mercy Graves |
Merlyn |
Metalhead |
Metallo |
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| Metamorpho |
Metron |
The Mime |
The Minstrel |
Mirrot Master |
Mr. Freeze |
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| Mr. Mind |
Mr. Miracle |
Mr. Mxyzptlk |
Mr. Terrific |
Mr. Zsasz |
Mrs. Hyde |
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| Mon-el |
Mongul |
The Monocle |
Mordru |
Morgaine le Fey |
Mothman |
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| Music Master |
Musketeer |
Mutant Leader |
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| Mogo |
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| Nam-Ek |
Negative Man |
Nemesis |
Neron |
Nightwing |
Night Girl |
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| Nite Owl I |
Nite Owl II |
Non |
Nostromos |
Nuclear Man |
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| The Nuclear Family |
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.gif "Oracle") |
| Oberon |
Ocean Master |
Obsidian |
Onomatopoeia |
Onyx |
Oracle |
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| Orion |
Orca |
Owlman |
Ozymandias |