Massacooraman
Mbói Tu’ĩ
Mbwun
Medusa
Merlion
Mermaid
Merman
Michigan Dogman
Minokawa
Minotaur
Mishibizhiw
Misi-ginebig
Mngwa
Mokèlé-mbèmbé
Moñái
Mono Grande
Monocerus
Monopod
Morlocks
Mothman
Mugwump
Muldjewangk
Mungoon-Gali
Muscaliet
Mushhushshu
Musimon
Myrmecoleon
N-dam-keno-wet
Nahuelito
Namazu
Nandi Bear
Nargun
Nemean Lion
Nephilim
Nguruvilu
Nian
Níðhöggr
Nikusui
Ninki Nanka
Nobusuma
Nozuchi
Nuckelavee
Nue
Nuli
Nuppeppo
Nure-onna
Ogopogo
Ogre
Oilliphéist
Ojáncanu
Okuri-inu
Ōmukade
Onocentaur
Onza
Oozlum bird
Ophiotaurus
Opinicus
Orabou
Ork
Orphan Bird