- MacGillivray's Warbler
- Madagascar Buttonquail
- Madagascar Cisticola
- Madagascar Cuckooshrike
- Madagascar Fish Eagle
- Madagascar Harrier-Hawk
- Madagascar Hoopoe
- Madagascar Lark
- Madagascar Magpie-Robin
- Madagascar Mannikin
- Madagascar Owl
- Madagascar Stonechat
- Madagascar Wagtail
- Magnificent Frigatebird
- Magpie Shrike
- Magpie Tanager
- Malabar Pied Hornbill
- Malachite Kingfisher
- Malachite Sunbird
- Malagasy Brush Warbler
- Malagasy Bulbul
- Malagasy Coucal
- Malagasy Green Sunbird
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Paradise Flycatcher
- Malagasy Turtle Dove
- Malagasy White-eye
- Malaysian Pied Fantail
- Malindi Pipit
- Mallard
- Mandarin Duck
- Mangrove Kingfisher
- Mangrove Swallow
- Mangrove Warbler
- Many-banded Aracari
- Many-spotted Hummingbird
- Marabou Stork
- Marble-faced Bristle Tyrant
- Marico Flycatcher
- Marico Sunbird
- Maroon-bellied Parakeet
- Marsh Antwren
- Marsh Sandpiper
- Marsh Tit
- Marshall's Iora
- Martial Eagle
- Masked Crimson Tanager
- Masked Flowerpiercer
- Masked Tityra
- Masked Trogon
- Masked Water Tyrant
- Meadow Pipit
- Mealy Amazon
- Mediterranean Gull
- Mediterranean Short-toed Lark
- Medium Egret
- Melodious Blackbird
- Melodious Warbler
- Meves's Starling
- Mexican Violetear
- Meyer's Parrot
- Middle Spotted Woodpecker
- Military Macaw
- Mistle Thrush
- Mocking Cliff Chat
- Monk Parakeet
- Montagu's Harrier
- Montane Woodcreeper
- Monteiro's Hornbill
- Montezuma Oropendola
- Morelet's Seedeater
- Mosque Swallow
- Moss-backed Tanager
- Mountain Bluebird
- Mountain Chat
- Mountain Elaenia
- Mountain Masked Apalis
- Mountain Velvetbreast
- Mountain Wren
- Mourning Collared Dove
- Moustached Antpitta
- Moustached Grass Warbler
- Muscovy Duck
- Mute Swan