- Cabot's Tragopan
- Cape Barren Goose
- Cape Crow
- Cape Sparrow
- Cape Teal
- Cape Vulture
- Cape Wagtail
- Cardinal Lory
- Carrion Crow
- Cheer Pheasant
- Chestnut-capped Puffbird
- Chestnut-crowned Foliage-gleaner
- Chestnut-eared Aracari
- Chestnut-fronted Macaw
- Chinese Hwamei
- Cirl Bunting
- Collared Aracari
- Collared Imperial Pigeon
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Firecrest
- Common Gallinule
- Common Greenshank
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Moorhen
- Common Murre
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Sandpiper
- Common Starling
- Common Swift
- Common Tern
- Common Waxbill
- Common Wood Pigeon
- Corn Crake
- Crested Coua
- Crested Drongo
- Crested Partridge
- Crimson-breasted Shrike
- Crimson-crested Woodpecker
- Crowned Cormorant
- Crowned Hornbill
- Crowned Lapwing
- Cuban Amazon
- Curl-crested Aracari
- Curlew Sandpiper