- Magenta-throated Woodstar
- Magnificent Frigatebird
- Magpie Shrike
- Malachite Kingfisher
- Malagasy Turtle Dove
- Mangrove Swallow
- Mangrove Warbler
- Many-striped Canastero
- Marabou Stork
- Marbled Duck
- Marico Flycatcher
- Marsh Owl
- Marsh Tit
- Marsh Warbler
- Mascarene Martin
- Masked Flowerpiercer
- Masked Tanager
- Masked Tityra
- Masked Trogon
- Mato Grosso Antbird
- Mauritius Bulbul
- Mauritius Cuckooshrike
- Mauritius Fody
- Mauritius Olive White-eye
- Meadow Pipit
- Mealy Amazon
- Mediterranean Gull
- Mediterranean Short-toed Lark
- Medium Egret
- Melodious Warbler
- Merlin
- Middle Spotted Woodpecker
- Mistle Thrush
- Monk Parakeet
- Montagu's Harrier
- Montane Woodcreeper
- Montezuma Oropendola
- Mountain Bluebird
- Mountain Cacique
- Mourning Collared Dove
- Mourning Dove
- Moustached Antpitta
- Muscovy Duck
- Mute Swan