- Macaroni Penguin
- MacGregor's Honeyeater
- Mackinnon's Shrike
- Madagascan Buzzard
- Madagascan Cuckoo-Hawk
- Madagascan Flufftail
- Madagascan Nightjar
- Madagascan Owl
- Madagascan Pygmy Kingfisher
- Madagascan Sandgrouse
- Madagascan Serpent Eagle
- Madagascan Wood Rail
- 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
- 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
- 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