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| Mad Luc | human | male | POTA: Resistance | forest dweller, approx. 40 years old, loner | |
| Maga | gorilla | male | POTA: Force | soldier who fought with Attar, falls into crypt with Ari | |
| Magnum | human | male | Dawn of the Tree People (Power Records) | leader of the tree people | |
| Malagueña | human | female | POTA Magazine | ||
| Mandemus | orangutan | male | Battle for the POTA | Ayres, Lew | keeper of the armory |
| Maximus, Camp Administrator | chimpanzee | male | POTA: Urchak's Folly (Adventure Comics) | administrator of Urchak's bridge-building camp | |
| Maximus, Doctor | orangutan | male | POTA (1968) | Parfrey, Woodrow | inhabitant of Ape City; member of National Academy, Commissioner for Animal Affairs, sits on tribunal judging Col. Taylor |
| McDonald (1) | human | male | Conquest of the POTA | Rhodes, Hari | chief aide to Gov. Breck |
| McDonald (2) | human | male | Battle for the POTA | Stoker, Austin | inhabitant of Ape City; younger brother of McDonald (1), advisor to Ceaser |
| Mellie | human | female | POTA: Resistance | elder in Tek clan | |
| Menluth | orangutan | male | Return to the POTA Ep. 6 "Terror On Ice Mountain" | inhabitant of Mount Garr, High Priest of Kygoor | |
| Mendez | Mutant human | male | Battle for the POTA | Stevens, Paul | inhabtant of Forbidden City, second in command to Kolp, take control upon Kolp's death |
| Mendez XXVI | Mutant human | male | Beneath the POTA | Richards, Paul | Leader of race of mutants living in the ruins of NYC in the 40th century |
| Milo | chimpanzee | male | Escape from the POTA | named after Dr. Milo, offspring of Dr. Zira, raised by Armando in circus, name changed to Caesar as adult | |
| Milo, Doctor | chimpanzee | male | Escape from the POTA | Mineo, Sal | scientist, accompanies Dr. Zira and Cornelius in space ship; killed by primitive, caged gorilla |
| Miranda | human | female | POTA: Urchak's Folly (Adventure Comics) | Taylorite priestess; awaits coming of prophesied savior Taylor | |
| Molan | human | male | Dawn of the Tree People (Power Records) | son of Magnum | |
| Mongo | chimpanzee | male | Ape City (Adventure Comics) | rock singer, friend of Fats | |
| Morris | chimpanzee | male | POTA: Urchak's Folly (Adventure Comics) | works with Dr. Titus, involved in plot to destroy bridge | |
| Mud People | human-ape hybrid | POTA: Urchak's Folly (Adventure Comics) | valley tribe, followers of awaited, prophesied savior Taylor; called 'Troglodytes' or 'Trogs' by the apes | ||
| Mulla, Captain | gorilla | male | Return to the POTA Ep. 4 "Tunnel of Fear" | aide-de-camp to Gen. Urko | |
| Mungwort, Private | gorilla | male | Return to the POTA Ep. 4 "Tunnel of Fear" | friend of Pvt. Pooka, soldier in Gen. Urko's expeditionary force into the Forbidden Zone | |
| Muvala, Elder | ape | Return to the POTA Ep. 4 "Tunnel of Fear" | historical reference: the great Elder Muvala, noted for an ape aphorism | ||
| Mérou, Ulysse | human | male | Planète des singes [Monkey Planet] Boulle (1963) | protagonist in Boulle's novel; journalist on board interplanetary mission to Betelgeuse system, accompanied by Professeur Antelle, Arthur Levain, and chimpanzee Hector |
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