- Cabanis's Wren
- Cackling Goose
- Cactus Wren
- California Scrub Jay
- California Thrasher
- Camiguin Hanging Parrot
- Canada Warbler
- Canyon Wren
- Cape May Warbler
- Carolina Wren
- Chalk-browed Mockingbird
- Chestnut-breasted Wren
- Chestnut-capped Laughingthrush
- Chestnut-sided Warbler
- Chilean Mockingbird
- Chimney Swift
- Cinnamon Teal
- Clarion Wren
- Cobb's Wren
- Collared Kingfisher
- Common Blackbird
- Common Cactus Finch
- Common Eider
- Common Goldeneye
- Common Hill Myna
- Common Kingfisher
- Common Merganser
- Common Paradise Kingfisher
- Common Starling
- Common Yellowthroat
- Connecticut Warbler
- Cooper's Hawk
- Copper-throated Sunbird
- Coraya Wren
- Cozumel Thrasher
- Crested Jayshrike
- Crimson-crested Woodpecker
- Crimson-headed Partridge
- Crimson Rosella
- Crissal Thrasher
- Cuban Pewee
- Cuban Trogon
- Curve-billed Thrasher