- Caatinga Cacholote
- Cackling Goose
- California Quail
- Campo Flicker
- Canada Goose
- Cape Barren Goose
- Cape Bunting
- Cape Cormorant
- Cape Crow
- Cape Sparrow
- Cape Starling
- Cape Teal
- Cape Wagtail
- Capuchinbird
- Cardinal Lory
- Cardinal Woodpecker
- Carib Grackle
- Carp's Tit
- Carrion Crow
- Caspian Gull
- Cattle Tyrant
- Chabert Vanga
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Changeable Hawk-Eagle
- Channel-billed Cuckoo
- Channel-billed Toucan (ariel)
- Channel-billed Toucan (culminatus)
- Cheer Pheasant
- Chestnut-backed Thrush
- Chestnut-bellied Partridge
- Chestnut-bellied Starling
- Chestnut-breasted Mannikin
- Chestnut-capped Laughingthrush
- Chestnut-eared Aracari
- Chestnut-headed Bee-eater
- Chestnut Sparrow
- Chestnut Teal
- Chiguanco Thrush
- Chilean Flamingo
- Chiloe Wigeon
- Chinese Bamboo Partridge
- Chinese Pond Heron
- Chopi Blackbird
- Cinereous Conebill
- Cinereous Tit
- Cinereous Vulture
- Cinnamon-breasted Bunting
- Cinnamon-headed Green Pigeon
- Cinnamon-rumped Seedeater
- Cinnamon Ground Dove
- Cinnamon Teal
- Citrine Lorikeet
- Clay-colored Thrush
- Cloven-feathered Dove
- Cobalt-winged Parakeet
- Cockatiel
- Cocoi Heron
- Coconut Lorikeet
- Coleto
- Collared Aracari
- Collared Kingfisher
- Collared Palm Thrush
- Collared Pratincole
- Collared Sparrowhawk
- Collared Whitestart
- Comb-crested Jacana
- Comb Duck
- Common Babbler
- Common Black Hawk
- Common Blackbird
- Common Bulbul
- Common Bush Tanager
- Common Buzzard
- Common Chaffinch
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Flameback
- Common Gallinule
- Common Goldeneye
- Common Green Magpie
- Common Greenshank
- Common Ground Dove
- Common Hill Myna
- Common House Martin
- Common Iora
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Redpoll
- Common Redshank
- Common Reed Bunting
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tailorbird
- Common Tern
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Congo Peafowl
- Coppersmith Barbet
- Coral-billed Ground Cuckoo
- Cordilleran Parakeet
- Coscoroba Swan
- Cotton Pygmy Goose
- Cream-winged Cinclodes
- Crested Barbet
- Crested Coua
- Crested Drongo
- Crested Fireback
- Crested Francolin
- Crested Guineafowl
- Crested Lark
- Crested Myna
- Crested Oropendola
- Crested Partridge
- Crested Pigeon
- Crested Quail-Dove
- Crested Serpent Eagle
- Crestless Curassow
- Crimson-breasted Shrike
- Crimson Finch
- Crimson Rosella
- Croaking Ground Dove
- Crowned Cormorant
- Crowned Hornbill
- Crowned Lapwing
- Cuban Blackbird
- Cuban Emerald
- Cuban Green Woodpecker
- Cuban Martin
- Cuban Oriole
- Cuban Parakeet
- Cuban Pygmy Owl
- Cuban Tody
- Cuban Trogon
- Cuckoo Roller
- Curl-crested Aracari
- Curlew Sandpiper
- Cut-throat Finch