- Macaroni Penguin
- MacGregor's Honeyeater
- Mackinnon's Shrike
- Madagascar Buzzard
- Madagascar Cuckoo-Hawk
- Madagascar Flufftail
- Madagascar Forest Rail
- Madagascar Nightjar
- Madagascar Owl
- Madagascar Pygmy Kingfisher
- Madagascar Sandgrouse
- Madagascar Serpent Eagle
- Magellanic Plover
- Magellanic Woodpecker
- Malabar Barbet
- Malachite Kingfisher
- Malachite Sunbird
- Malagasy Green Sunbird
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Pond Heron
- Malayan Laughingthrush
- Malleefowl
- Mangrove Cuckoo
- Mangrove Kingfisher
- Mangrove Rail
- Many-colored Chaco Finch
- Maranon Thrush
- Marico Sunbird
- Markham's Storm Petrel
- Marsh Owl
- Mascarene Parrot
- Mauritius Bulbul
- Mayotte Sunbird
- Meadow Bunting
- Medium Egret
- Menetries's Warbler
- Metallic-winged Sunbird
- Middle American Screech Owl
- Middle Spotted Woodpecker
- Mindoro Imperial Pigeon
- Mistle Thrush
- Moluccan Dwarf Kingfisher
- Moluccan Hanging Parrot
- Moluccan Scops Owl
- Monk Parakeet
- Moorland Chat
- Mottled Mannikin
- Mountain Hawk-Eagle
- Mountain Peacock-Pheasant
- Mountain Pygmy Owl
- Mountain Scops Owl
- Mountain Thrush
- Moustached Barbet
- Moustached Kingfisher
- Mrs. Gould's Sunbird
- Multicolored Tanager
- Musician Wren
- Musk Lorikeet