- Magnificent Frigatebird
- Magpie Shrike
- Mallard
- Mangrove Warbler
- Manx Shearwater
- Marabou Stork
- Marail Guan
- Marico Flycatcher
- Marico Sunbird
- Marsh Tit
- Martial Eagle
- Masked Duck
- Masked Yellowthroat
- McConnell's Flycatcher
- McConnell's Spinetail
- Meadow Pipit
- Melodious Warbler
- Meves's Starling
- Mew Gull
- Mistle Thrush
- Monteiro's Hornbill
- Mottled Owl
- Mountain Wheatear
- Mouse-colored Antshrike
- Mouse-colored Tyrannulet
- Muscovy Duck
- Musician Wren
- Mute Swan