- Macaroni Penguin
- MacGregor's Honeyeater
- Mackinnon's Shrike
- Macleay's Honeyeater
- Macqueen's Bustard
- Madagascan Blue Pigeon
- Madagascan Buttonquail
- Madagascan Buzzard
- Madagascan Cisticola
- Madagascan Cuckoo
- Madagascan Cuckooshrike
- Madagascan Fish Eagle
- Madagascan Flufftail
- Madagascan Grebe
- Madagascan Green Pigeon
- Madagascan Harrier-Hawk
- Madagascan Hoopoe
- Madagascan Ibis
- Madagascan Jacana
- Madagascan Lark
- Madagascan Magpie-Robin
- Madagascan Mannikin
- Madagascan Nightjar
- Madagascan Owl
- Madagascan Partridge
- Madagascan Plover
- Madagascan Pochard
- Madagascan Pratincole
- Madagascan Pygmy Kingfisher
- Madagascan Rail
- Madagascan Sandgrouse
- Madagascan Snipe
- Madagascan Sparrowhawk
- Madagascan Spinetail
- Madagascan Starling
- Madagascan Stonechat
- Madagascan Swamp Warbler
- Madagascan Wagtail
- Madagascan Wood Rail
- Madeira Firecrest
- Magellanic Oystercatcher
- Magellanic Penguin
- Magnificent Bird-of-paradise
- Magnificent Frigatebird
- Magnificent Riflebird
- Magnolia Warbler
- Magpie-lark
- Magpie Goose
- Magpie Mannikin
- Magpie Shrike
- Magpie Starling
- Magpie Tanager
- Maguari Stork
- Malabar Barbet
- Malabar Grey Hornbill
- Malabar Lark
- Malabar Starling
- Malabar Trogon
- Malabar Whistling Thrush
- Malabar Woodshrike
- Malachite Kingfisher
- Malachite Sunbird
- Malagasy Black Swift
- Malagasy Brush Warbler
- Malagasy Bulbul
- Malagasy Coucal
- Malagasy Green Sunbird
- Malagasy Harrier
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Palm Swift
- Malagasy Paradise Flycatcher
- Malagasy Pond Heron
- Malagasy Sacred Ibis
- Malagasy Turtle Dove
- Malagasy White-eye
- Malayan Banded Pitta
- Malaysian Blue Flycatcher
- Malaysian Honeyguide
- Malaysian Pied Fantail
- Malaysian Plover
- Malia
- Malindi Pipit
- Mallard
- Mallee Emu-wren
- Malleefowl
- Mandarin Duck
- Maned Duck
- Mangrove Cuckoo
- Mangrove Fantail
- Mangrove Gerygone
- Mangrove Hummingbird
- Mangrove Kingfisher
- Mangrove Pitta
- Mangrove Robin
- Mangrove Sunbird
- Mangrove Swallow
- Mangrove Vireo
- Mangrove Warbler
- Mangrove Whistler
- Manipur Fulvetta
- Manx Shearwater
- Many-banded Aracari
- Many-colored Rush Tyrant
- Many-spotted Hummingbird
- Marabou Stork
- Maranon Pigeon
- Maranon Thrush
- Marbled Duck
- Marbled Frogmouth
- Marbled Godwit
- Marico Flycatcher
- Marico Sunbird
- Marigold Lorikeet
- Maroon-backed Accentor
- Maroon-bellied Parakeet
- Maroon-tailed Parakeet
- Maroon Oriole
- Maroon Woodpecker
- Marsh Babbler
- Marsh Owl
- Marsh Sandpiper
- Marsh Tchagra
- Marsh Tit
- Martial Eagle
- Marvelous Spatuletail
- Mascarene Martin
- Masked Booby
- Masked Bowerbird
- Masked Crimson Tanager
- Masked Finch
- Masked Flowerpiercer
- Masked Lapwing
- Masked Shrike
- Masked Tanager
- Masked Tityra
- Masked Trogon
- Masked Water Tyrant
- Masked Woodswallow
- Maxwell's Black Weaver
- Mayotte Drongo
- Mayotte Sunbird
- Mayotte White-eye
- Meadow Pipit
- Mediterranean Short-toed Lark
- Medium Ground Finch
- Melancholy Woodpecker
- Meller's Duck
- Melodious Blackbird
- Metallic Pigeon
- Metallic Starling
- Meves's Starling
- Mew Gull
- Mexican Cacique
- Mexican Chickadee
- Mexican Violetear
- Meyer's Parrot
- Mid-mountain Berrypecker
- Middle Spotted Woodpecker
- Mimic Honeyeater
- Miombo Blue-eared Starling
- Miombo Rock Thrush
- Miombo Tit
- Mistle Thrush
- Mistletoe Tyrannulet
- Mistletoebird
- Mitred Parakeet
- Mocking Cliff Chat
- Moluccan Flycatcher
- Moluccan Hanging Parrot
- Moluccan Megapode
- Moluccan Monarch
- Moluccan Owlet-nightjar
- Moluccan Scops Owl
- Moluccan Starling
- Mombasa Woodpecker
- Monk Parakeet
- Monotonous Lark
- Montagu's Harrier
- Montane Widowbird
- Montane Woodcreeper
- Monteiro's Bushshrike
- Montezuma Oropendola
- Moorland Chat
- Morelet's Seedeater
- Mosque Swallow
- Mottle-cheeked Tyrannulet
- Mottled Owl
- Mottled Swift
- Mottled Wood Owl
- Mountain Bulbul
- Mountain Buzzard
- Mountain Caracara
- Mountain Elaenia
- Mountain Greenbul
- Mountain Hawk-Eagle
- Mountain Illadopsis
- Mountain Imperial Pigeon
- Mountain Oriole
- Mountain Owlet-nightjar
- Mountain Peltops
- Mountain Pygmy Owl
- Mountain Robin
- Mountain Tailorbird
- Mountain Thrush
- Mountain Trogon
- Mountain Velvetbreast
- Mountain Wagtail
- Mountain Wheatear
- Mountain Yellow Warbler
- Mourning Collared Dove
- Mourning Sierra Finch
- Mouse-colored Penduline Tit
- Mouse-colored Tyrannulet
- Moussier's Redstart
- Moustached Babbler
- Moustached Grass Warbler
- Moustached Tinkerbird
- Moustached Treeswift
- Moustached Wren
- Mrs. Gould's Sunbird
- Mulga Parrot
- Multicolored Tanager
- Muscovy Duck
- Musk Duck
- Musk Lorikeet
- Mute Swan