- Magpie Goose
- Malagasy Pond Heron
- Malaysian Pied Fantail
- Mallard
- Mandarin Duck
- Maned Duck
- Mangrove Swallow
- Marabou Stork
- Marbled Duck
- Marsh Tit
- Masked Crimson Tanager
- Masked Lapwing
- Mexican Violetear
- Military Macaw
- Mindanao Bleeding-heart
- Mindanao Lorikeet
- Mistle Thrush
- Montezuma Oropendola
- Montserrat Oriole
- Morepork
- Mountain Elaenia
- Muscovy Duck