- Magnificent Frigatebird
- Magnolia Warbler
- Mallard
- Mangrove Cuckoo
- Mangrove Hummingbird
- Mangrove Rail
- Mangrove Swallow
- Mangrove Warbler
- Marsh Wren
- Masked Duck
- Masked Flowerpiercer
- Masked Tityra
- Masked Trogon
- Mealy Amazon
- Melodious Blackbird
- Merlin
- Mexican Cacique
- Mexican Violetear
- Montezuma Oropendola
- Morelet's Seedeater
- Mottled Owl
- Mountain Elaenia
- Mountain Thrush
- Mountain Velvetbreast
- Mourning Dove
- Mourning Warbler
- Muisca Antpitta
- Multicolored Tanager
- Mute Swan
- Myrtle Warbler