- Calandra Lark
- California Quail
- California Thrasher
- California Towhee
- Canada Goose
- Canada Jay
- Canada Warbler
- Canary Islands Stonechat
- Cape Crow
- Cape May Warbler
- Capped Conebill
- Carib Grackle
- Caribbean Elaenia
- Carolina Chickadee
- Carolina Wren
- Caspian Tern
- Cassin's Kingbird
- Cattle Tyrant
- Cauca Guan
- Cedar Waxwing
- Cerulean Warbler
- Cetti's Warbler
- Chestnut-backed Antbird
- Chestnut-backed Sparrow-Lark
- Chestnut-bellied Sandgrouse
- Chestnut-capped Laughingthrush
- Chestnut-capped Warbler
- Chestnut-crowned Antpitta
- Chestnut-headed Bee-eater
- Chestnut-naped Spurfowl
- Chestnut-sided Warbler
- Chestnut-tailed Starling
- Chilean Flamingo
- Chinese Blue Flycatcher
- Chinese Egret
- Chipping Sparrow
- Cinnamon-bellied Saltator
- Cinnamon-breasted Bunting
- Cinnamon Becard
- Cinnamon Teal
- Citril Finch
- Citrine Wagtail
- Clamorous Reed Warbler
- Clapper Rail
- Clark's Grebe
- Clay-colored Thrush
- Coal Tit
- Cocoa Woodcreeper
- Collared Aracari
- Collared Flycatcher
- Collared Inca
- Collared Kingfisher
- Collared Pratincole
- Collared Scops Owl
- Collared Whitestart
- Colombian Chachalaca
- Common Black Hawk
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Chlorospingus (ophthalmicus)
- Common Crane
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Firecrest
- Common Flameback
- Common Gallinule
- Common Goldeneye
- Common Grackle
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Iora
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Whitethroat
- Common Wood Pigeon
- Common Yellowthroat
- Cooper's Hawk
- Coppersmith Barbet
- Coraya Wren
- Corn Bunting
- Crab-plover
- Cream-colored Courser
- Cream-colored Woodpecker
- Cream-vented Bulbul
- Crescent-faced Antpitta
- Crested Ant Tanager
- Crested Caracara (cheriway)
- Crested Francolin
- Crested Guan
- Crested Lark
- Crested Oropendola
- Crested Serpent Eagle
- Crested Tit
- Crimson-backed Tanager
- Crimson-collared Tanager
- Crimson-hooded Manakin
- Crimson Sunbird
- Crow-billed Drongo
- Crowned Lapwing
- Crowned Woodnymph
- Curlew Sandpiper
- Cut-throat Finch
- Cyprus Warbler
- Cyprus Wheatear