- Maccoa Duck
- MacGregor's Bowerbird
- Madagascar Blue Pigeon
- Madagascar Blue Vanga
- Madagascar Buttonquail
- Madagascar Buzzard
- Madagascar Cisticola
- Madagascar Cuckoo
- Madagascar Fish Eagle
- Madagascar Flufftail
- Madagascar Green Pigeon
- Madagascar Harrier-Hawk
- Madagascar Hoopoe
- Madagascar Ibis
- Madagascar Jacana
- Madagascar Lark
- Madagascar Magpie-Robin
- Madagascar Nightjar
- Madagascar Partridge
- Madagascar Plover
- Madagascar Pygmy Kingfisher
- Madagascar Sandgrouse
- Madagascar Snipe
- Madagascar Starling
- Madagascar Stonechat
- Madagascar Swamp Warbler
- Madagascar Wagtail
- Madarasz's Tiger Parrot
- Magnificent Frigatebird
- Magpie-lark
- Magpie Mannikin
- Magpie Shrike
- Magpie Tanager
- Malabar Pied Hornbill
- Malabar Trogon
- Malachite Kingfisher
- Malagasy Bulbul
- Malagasy Coucal
- Malagasy Green Sunbird
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Paradise Flycatcher
- Malagasy Turtle Dove
- Malagasy White-eye
- Malaysian Pied Fantail
- Malaysian Plover
- Mallard
- Malleefowl
- Mandarin Duck
- Maned Duck
- Mangrove Swallow
- Mangrove Warbler
- Many-banded Aracari
- Many-colored Rush Tyrant
- Many-spotted Hummingbird
- Many-striped Canastero
- Marabou Stork
- Marble-faced Bristle Tyrant
- Marbled Duck
- Marbled Honeyeater
- Maroon-tailed Parakeet
- Marsh Sandpiper
- Marsh Tit
- Marsh Warbler
- Martial Eagle
- Martinique Oriole
- Marvelous Spatuletail
- Mascarene Martin
- Masked Flowerpiercer
- Masked Gnatcatcher
- Masked Lapwing
- Masked Laughingthrush
- Masked Tityra
- Masked Trogon
- Masked Water Tyrant
- Masked Yellowthroat
- Meadow Pipit
- Mealy Amazon
- Melodious Warbler
- Mexican Violetear
- Meyer's Parrot
- Mimic Honeyeater
- Mistletoe Tyrannulet
- Mocking Cliff Chat
- Monk Parakeet
- Montane Woodcreeper
- Montezuma Oropendola
- Moss-backed Tanager
- Mountain Cacique
- Mountain Caracara
- Mountain Fulvetta
- Mountain Imperial Pigeon
- Mountain Peltops
- Mountain Tailorbird
- Mountain Thrush
- Mountain Wagtail
- Mourning Collared Dove
- Moustached Antpitta
- Moustached Flowerpiercer
- Mrs. Gould's Sunbird
- Mulga Parrot
- Muscovy Duck
- Musician Wren
- Musk Duck
- Musk Lorikeet
- Mute Swan