- Caatinga Antwren
- Caatinga Cacholote
- Cabot's Tern
- Campo Flicker
- Campo Troupial
- Canada Goose
- Canada Warbler
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Cormorant
- Cape Crow
- Cape Gannet
- Cape Grassbird
- Cape Longclaw
- Cape Robin-Chat
- Cape Rock Thrush
- Cape Rockjumper
- 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
- Cardinal Woodpecker
- Carib Grackle
- Cattle Tyrant
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Channel-billed Toucan (culminatus)
- Chat Flycatcher
- Chestnut-backed Antshrike
- Chestnut-bellied Euphonia
- Chestnut-bellied Seed Finch
- Chestnut-capped Blackbird
- Chestnut-capped Brushfinch
- Chestnut-capped Warbler
- Chestnut-crowned Becard
- Chestnut-eared Aracari
- Chestnut-fronted Macaw
- Chestnut-headed Oropendola
- Chestnut-vented Conebill
- Chestnut-vented Warbler
- Chestnut Piculet
- Chestnut Wood Quail
- Chiguanco Thrush
- Chilean Flamingo
- Chilean Skua
- Chilean Swallow
- Chiloe Wigeon
- Chimango Caracara
- Chinspot Batis
- Chivi Vireo
- Choco Brushfinch
- Chopi Blackbird
- Chorister Robin-Chat
- Chotoy Spinetail
- Cinereous Conebill
- Cinereous Harrier
- Cinereous Tyrant
- Cinereous Warbling Finch
- Cinnamon-breasted Bunting
- Cinnamon Becard
- Cinnamon Flycatcher
- Cinnamon Tanager
- Cinnamon Teal
- Citrine Warbler
- Clay-colored Thrush
- Cliff Flycatcher
- Cliff Parakeet
- Coal-crested Finch
- Cobalt-rumped Parrotlet
- Cobalt-winged Parakeet
- Cochabamba Mountain Finch
- Cock-tailed Tyrant
- Cocoi Heron
- Collared Crescentchest
- Collared Palm Thrush
- Collared Plover
- Collared Pratincole
- Collared Sunbird
- Collared Trogon
- Colombian Chachalaca
- Common Black Hawk
- Common Bulbul (tricolor)
- Common Buttonquail
- Common Buzzard
- Common Chlorospingus
- Common Gallinule
- Common Goldeneye
- Common Greenshank
- Common Gull
- Common Miner
- Common Moorhen
- Common Myna
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Ringed Plover
- Common Sandpiper
- Common Scimitarbill
- Common Snipe
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Cone-billed Tanager
- Copper Seedeater
- Coqui Francolin
- Cordilleran Canastero
- Corn Bunting
- Cory's Shearwater
- Coscoroba Swan
- Crane Hawk
- Cream-colored Woodpecker
- Cream-winged Cinclodes
- Creamy-bellied Thrush
- Crescent-chested Puffbird
- Crested Barbet
- Crested Becard
- Crested Black Tyrant
- Crested Bobwhite
- Crested Caracara
- Crested Duck
- Crested Francolin
- Crested Oropendola
- Crimson-breasted Shrike
- Crimson-crested Woodpecker
- Crimson-mantled Woodpecker
- Croaking Ground Dove
- Crowned Chat-Tyrant
- Crowned Cormorant
- Crowned Hornbill
- Crowned Lapwing
- Crowned Slaty Flycatcher
- Cuban Blackbird
- Cuckoo-finch
- Curl-crested Jay
- Curlew Sandpiper