- Magnificent Riflebird
- Magpie Shrike
- Magpie Tanager
- Maguari Stork
- Malachite Kingfisher
- Malachite Sunbird
- Maned Duck
- Mangrove Swallow
- Marabou Stork
- Marico Flycatcher
- Marsh Sandpiper
- Masked Flowerpiercer
- Masked Gnatcatcher
- Masked Lapwing
- Masked Tityra
- Masked Trogon
- Masked Water Tyrant
- Mealy Amazon
- Medium Egret
- Melanesian Megapode
- Melodious Blackbird
- Meves's Starling
- Meyer's Parrot
- Mistletoe Tyrannulet
- Mistletoebird
- Mocking Cliff Chat
- Monk Parakeet
- Monotonous Lark
- Montane Woodcreeper
- Monteiro's Hornbill
- Montezuma Oropendola
- Moorland Chat
- Morelet's Seedeater
- Mottle-backed Elaenia
- Mottled Owl
- Mountain Chat
- Mountain Elaenia
- Mountain Thrush