- Cetti's Warbler
- Chiloe Wigeon
- Cirl Bunting
- Citril Finch
- Coal Tit
- Collared Flycatcher
- Collared Pratincole
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Goldeneye
- Common Greenshank
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Loon
- Common Merganser
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Redstart
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Swift
- Common Tern
- Corn Bunting
- Crested Lark
- Crested Tit
- Curlew Sandpiper