Science magazines
- Minnesota Dwarf Trout Lily
- Mission Blue Butterfly
- Mississippi Sandhill Crane
- Missouri Bladderpod
- Mitchell's Satyr Butterfly
- Mitracarpus Maxwelliae
- Mitracarpus Polycladus
- Moapa Dace
- Modoc Sucker
- Mohave Tui Chub
- Mohr's Barbara Button
- Molokai Creeper
- Molokai Thrush
- Mona Boa
- Mona Island Ground Iguana
- Monito Gecko
- Monterey Clover
- Monterey Gilia
- Monterey Spineflower
- Morefield's Leather Flower