- Magpie Tanager
- Mangrove Warbler
- Many-colored Rush Tyrant
- Maranon Gnatcatcher
- Maranon Thrush
- Marcapata Spinetail
- Marsh Warbler
- Martial Eagle
- Marvelous Spatuletail
- Masked Fruiteater
- Masked Water Tyrant
- Mexican Violetear
- Montane Woodcreeper
- Mountain Caracara
- Mountain Wren
- Mourning Sierra Finch
- Moustached Flowerpiercer
- Moustached Turca
- Muisca Antpitta