- Magenta-throated Woodstar
- Magnificent Frigatebird
- Magnolia Warbler
- Magpie-lark
- Magpie Shrike
- Malachite Kingfisher
- Mallard
- Maned Duck
- Mangrove Kingfisher
- Mangrove Swallow
- Many-banded Aracari
- Marabou Stork
- Marsh Tit
- Masked Flowerpiercer
- Masked Tityra
- Masked Trogon
- Mediterranean Gull
- Medium Ground Finch
- Melodious Warbler
- Merlin
- Mexican Violetear
- Middle Spotted Woodpecker
- Mitred Parakeet
- Mocking Cliff Chat
- Montane Woodcreeper
- Montezuma Oropendola
- Mountain Velvetbreast
- Moustached Warbler
- Muisca Antpitta
- Mulga Parrot
- Muscovy Duck
- Musk Lorikeet
- Mute Swan
- Myrtle Warbler