- Cabot's Tern (eurygnathus)
- Caica Parrot
- Canada Warbler
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Cormorant
- Cape Crow
- Cape Eagle-Owl
- Cape Grassbird
- Cape Longclaw
- Cape Petrel
- Cape Robin-Chat
- Cape Rock Thrush
- Cape Shoveler
- Cape Sparrow
- Cape Spurfowl
- Cape Starling
- Cape Sugarbird
- Cape Teal
- Cape Vulture
- Cape Wagtail
- Cape Weaver
- Cape White-eye
- Capped Heron
- Capped Wheatear
- Capuchinbird
- Cardinal Woodpecker
- Carib Grackle
- Caribbean Elaenia
- Caribbean Martin
- Carrion Crow
- Carunculated Caracara
- Caspian Tern
- Cayenne Jay
- Cetti's Warbler
- Channel-billed Toucan
- Chapman's Antshrike
- Chapman's Swift
- Chestnut-backed Antbird
- Chestnut-backed Sparrow-Lark
- Chestnut-banded Plover
- Chestnut-bellied Seed Finch
- Chestnut-bellied Seedeater
- Chestnut-bellied Thrush
- Chestnut-belted Gnateater
- Chestnut-breasted Coronet
- Chestnut-collared Swallow
- Chestnut-collared Swift
- Chestnut-eared Aracari
- Chestnut-fronted Macaw
- Chestnut-naped Antpitta
- Chestnut-rumped Woodcreeper
- Chestnut-throated Seedeater
- Chestnut-vented Conebill
- Chestnut-vented Warbler
- Chestnut-winged Cinclodes
- Chestnut Woodpecker
- Chilean Flamingo
- Chinspot Batis
- Chivi Vireo
- Choco Toucan
- Choco Tyrannulet
- Cinereous Antshrike
- Cinereous Becard
- Cinereous Mourner
- Cinnamon-breasted Bunting
- Cinnamon-crested Spadebill
- Cinnamon-rumped Foliage-gleaner
- Cinnamon-throated Woodcreeper
- Cinnamon Attila
- Cinnamon Flycatcher
- Cinnamon Neopipo
- Cirl Bunting
- Cliff Flycatcher
- Cloud Cisticola
- Club-winged Manakin
- Coal Tit
- Cobalt-winged Parakeet
- Cocoa Thrush
- Cocoi Heron
- Collared Antshrike
- Collared Aracari
- Collared Gnatwren
- Collared Inca
- Collared Plover
- Collared Pratincole
- Collared Puffbird
- Collared Sunbird
- Collared Trogon
- Collared Warbling Finch
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Chlorospingus
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pochard
- Common Potoo
- Common Redpoll
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Ringed Plover
- Common Sandpiper
- Common Scale-backed Antbird
- Common Scimitarbill
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Copper Seedeater
- Coppery-chested Jacamar
- Coqui Francolin
- Coraya Wren
- Corn Bunting
- Crane Hawk
- Cream-colored Woodpecker
- Crested Barbet
- Crested Caracara (cheriway)
- Crested Eagle
- Crested Francolin
- Crested Lark
- Crested Oropendola
- Crested Tit
- Crimson-breasted Shrike
- Crimson-crested Woodpecker
- Crimson-hooded Manakin
- Crimson-mantled Woodpecker
- Crimson Topaz
- Croaking Cisticola
- Croaking Ground Dove
- Crowned Cormorant
- Crowned Eagle
- Crowned Hornbill
- Crowned Lapwing
- Crowned Woodnymph
- Curlew Sandpiper
- Curve-billed Scythebill