- Calandra Lark
- Canada Jay
- Cape Bunting
- Cape Grassbird
- Cape Robin-Chat
- Cape Rock Thrush
- Cape Shoveler
- Cape Sparrow
- Cape Sugarbird
- Cape Teal
- Cape Vulture
- Cape Weaver
- Cape White-eye
- Capped Wheatear
- Cardinal Woodpecker
- Carunculated Caracara
- Caspian Gull
- Caspian Tern
- Cedar Waxwing
- Cetti's Warbler
- Chestnut-tailed Starling
- Chestnut-winged Cinclodes
- Chinese Blue Flycatcher
- Chinese Pond Heron
- Chinese Vivid Niltava
- Chinspot Batis
- Chipping Sparrow
- Chukar Partridge
- Cinereous Bunting
- Cinereous Tit
- Cinereous Vulture
- Cinnamon Flycatcher
- Cirl Bunting
- Citril Finch
- Citrine Wagtail
- Club-winged Manakin
- Coal Tit
- Collared Falconet
- Collared Flycatcher
- Collared Inca
- Collared Scops Owl
- Common Blackbird
- Common Buzzard
- Common Cactus Finch
- Common Chiffchaff
- Common Chiffchaff (tristis)
- Common Crane
- Common Eider
- Common Emerald Dove
- Common Firecrest
- Common Goldeneye
- Common Greenshank
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- 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 Swift
- Common Tailorbird
- Common Tern
- Common Whitethroat
- Common Wood Pigeon
- Coppersmith Barbet
- Corn Bunting
- Cory's Shearwater
- Crested Barbet
- Crested Francolin
- Crested Goshawk
- Crested Lark
- Crested Serpent Eagle
- Crested Tit
- Cretzschmar's Bunting
- Crimson-mantled Woodpecker
- Crimson-rumped Toucanet
- Crimson Sunbird
- Crowned Hornbill
- Curlew Sandpiper