- Macaroni Penguin
- Magpie-lark
- Malachite Kingfisher
- Malagasy Turtle Dove
- Mallard
- Mangrove Sunbird
- Marbled Godwit
- Marsh Tit
- Martial Eagle
- Mascarene Paradise Flycatcher
- Masked Lapwing
- Meadow Pipit
- Melanesian Flycatcher
- Melodious Warbler
- Middle Spotted Woodpecker
- Mistle Thrush
- Moltoni's Warbler
- Montagu's Harrier
- Morepork
- Mosque Swallow
- Mottled Spinetail
- Mountain Bluebird
- Mountain Chickadee
- Mourning Collared Dove
- Moussier's Redstart
- Musk Duck
- Mute Swan