Anseriformes
- Anatidae
- Fulvous Whistling-Duck - Dendrocygna bicolor
- White-faced Whistling-Duck - Dendrocygna viduata
- Mute Swan - Cygnus olor
- Tundra Swan - Cygnus columbianus
- Whooper Swan - Cygnus cygnus
- Bean Goose - Anser fabalis
- Pink-footed Goose - Anser brachyrhynchus
- White-fronted Goose - Anser albifrons
- Lesser White-fronted Goose - Anser erythropus Vulnerable
- Greylag Goose - Anser anser
- Snow Goose - Anser caerulescens most records are presumed escapes from captivity
- Canada Goose - Branta canadensis
- Barnacle Goose - Branta leucopsis
- Brent Goose - Branta bernicla
- Red-breasted Goose - Branta ruficollis Vulnerable
- Egyptian Goose - Alopochen aegyptiaca
- Ruddy Shelduck - Tadorna ferruginea
- Common Shelduck - Tadorna tadorna
- Wood Duck - Aix sponsa Introduced species
- Wigeon - Anas penelope
- American Wigeon - Anas americana
- Gadwall - Anas strepera
- Baikal Teal - Anas formosa Vulnerable
- Common Teal - Anas crecca
- Mallard - Anas platyrhynchos
- Northern Pintail - Anas acuta
- Garganey - Anas querquedula
- Blue-winged Teal - Anas discors Rare/Accidental
- Northern Shoveler - Anas clypeata
- Marbled Teal - Marmaronetta angustirostris Vulnerable
- Red-crested Pochard - Netta rufina
- Pochard - Aythya ferina
- Ring-necked Duck - Aythya collaris Rare/Accidental
- Ferruginous Duck - Aythya nyroca Near-threatened
- Tufted Duck - Aythya fuligula
- Greater Scaup - Aythya marila
- Lesser Scaup - Aythya affinis
- Common Eider - Somateria mollissima
- King Eider - Somateria spectabilis
- Steller's Eider - Polysticta stelleri
- Long-tailed Duck - Clangula hyemalis
- Common Scoter - Melanitta nigra
- Surf Scoter - Melanitta perspicillata Rare/Accidental
- Velvet Scoter - Melanitta fusca
- Bufflehead - Bucephala albeola Rare/Accidental
- Barrow's Goldeneye - Bucephala islandica
- Common Goldeneye - Bucephala clangula
- Smew - Mergellus albellus
- Red-breasted Merganser - Mergus serrator
- Goosander - Mergus merganser
- Ruddy Duck - Oxyura jamaicensis
- White-headed Duck - Oxyura leucocephala Endangered
Read more about this topic: List Of Birds Of Spain