- Maccoa Duck
- Madagascan Blue Pigeon
- Madagascan Cisticola
- Madagascan Fish Eagle
- Madagascan Hoopoe
- Madagascan Ibis
- Madagascan Lark
- Madagascan Magpie-Robin
- Madagascan Mannikin
- Madagascan Partridge
- Madagascan Wagtail
- Madeira Firecrest
- Magpie-lark
- Magpie Goose
- Maguari Stork
- Major Mitchell's Cockatoo
- Malabar Pied Hornbill
- Malachite Kingfisher
- Malagasy Bulbul
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Paradise Flycatcher
- Malagasy Pond Heron
- Malagasy Sacred Ibis
- Malagasy White-eye
- Malayan Peacock-Pheasant
- Mallard
- Mandarin Duck
- Maned Duck
- Mangrove Sunbird
- Mangrove Swallow
- Marabou Stork
- Maranon Pigeon
- Marbled Duck
- Marico Sunbird
- Marigold Lorikeet
- Marsh Sandpiper
- Marsh Tit
- Marsh Warbler
- Martial Eagle
- Masked Crimson Tanager
- Masked Lapwing
- Masked Tityra
- Masked Water Tyrant
- Meadow Pipit
- Mediterranean Gull
- Melanesian Flycatcher
- Meller's Duck
- Melodious Blackbird
- Metallic Pigeon
- Metallic Starling
- Mew Gull
- Mexican Violetear
- Meyer's Parrot
- Military Macaw
- Milky Stork
- Mindanao Bleeding-heart
- Mindanao Lorikeet
- Mistle Thrush
- Mitred Parakeet
- Mocking Cliff Chat
- Moluccan King Parrot
- Monk Parakeet
- Montezuma Oropendola
- Montserrat Oriole
- Morelet's Seedeater
- Mountain Caracara
- Mountain Peacock-Pheasant
- Mountain Wheatear
- Mourning Collared Dove
- Mourning Dove
- Mourning Sierra Finch
- Muscovy Duck
- Mute Swan