- Cabot's Tern (eurygnathus)
- Calandra Lark
- California Towhee
- Calliope Hummingbird
- Canada Goose
- Canada Warbler
- Canary Islands Stonechat
- Cape Canary
- Cape Crow
- Cape May Warbler
- Capped Heron
- Capped Wheatear
- Carib Grackle
- Caribbean Elaenia
- Caribbean Martin
- Carrion Crow
- Caspian Tern
- Cassin's Kingbird
- Changeable Hawk-Eagle
- Channel-billed Toucan
- Checker-throated Stipplethroat
- Chestnut-bellied Seedeater
- Chestnut-capped Warbler
- Chestnut-rumped Woodcreeper
- Chestnut-sided Warbler
- Chilean Mockingbird
- Chilean Seaside Cinclodes
- Chilean Swallow
- Chimango Caracara
- Chinese Pond Heron
- Cinereous Antshrike
- Cinereous Becard
- Cinnamon-chested Bee-eater
- Cinnamon-crested Spadebill
- Cinnamon-rumped Foliage-gleaner
- Cinnamon-throated Woodcreeper
- Cinnamon Attila
- Cinnamon Woodpecker
- Cirl Bunting
- Clay-colored Thrush
- Coal Tit
- Cocoa Thrush
- Cocoa Woodcreeper
- Cocoi Heron
- Collared Forest Falcon
- Collared Kingfisher
- Collared Plover
- Collared Pratincole
- Collared Trogon
- Comb Duck
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Firecrest
- Common Gallinule
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Iora
- Common Kestrel
- Common Kestrel (canariensis)
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Sandpiper
- Common Scale-backed Antbird
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Common Woodshrike
- Comoro Blue Pigeon
- Comoro Fody
- Comoro Olive Pigeon
- Copper-rumped Hummingbird
- Coppersmith Barbet
- Coqui Francolin
- Corn Bunting
- Cory's Shearwater
- Cotton Pygmy Goose
- Crab-plover
- Crane Hawk
- Cream-colored Courser
- Cream-colored Woodpecker
- Crested Caracara (cheriway)
- Crested Coua
- Crested Drongo
- Crested Lark
- Crested Oropendola
- Crested Tit
- Crimson-backed Tanager
- Crimson-crested Woodpecker
- Crimson-hooded Manakin
- Crimson Topaz
- Crowned Hornbill
- Crowned Lapwing
- Crowned Woodnymph
- Cuban Amazon
- Cuban Black Hawk
- Cuban Blackbird
- Cuban Crow
- Cuban Emerald
- Cuban Green Woodpecker
- Cuban Pewee
- Cuban Pygmy Owl
- Cuban Tody
- Cuban Trogon
- Cuban Vireo
- Cuckoo-roller
- Curlew Sandpiper