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- Walking catfishSpecies of fish
- WalnutNut of any tree of the genus Juglans
- WalrusSpecies of marine mammal with tusks
- Walter Max ZimmermannGerman botanist
- WarmbloodMiddle-weight horse types and breeds
- WaspGroup of insects
- Water buffaloSpecies of large bovine
- Water vascular systemHydraulic system in echinoderm anatomy
- WatermelonPlant with large fruit
- WeaselMammal of the mustelid family
- WeevilSuperfamily of beetles
- Western honey beeSpecies of honey bee
- Westphalian hamWestphalian ham (German: Westfälischer Schinken) is a ham that was originally produced fro
- WhaleInformal group of large marine mammals
- Whale sharkLargest living species of fish
- Whale vocalizationSounds produced by whales
- Whale watchingViewing cetaceans in their habitats
- White-spotted pufferThe white-spotted puffer fish (Arothron hispidus) is a medium to large-sized puffer fish,
- White-throated toucanetThe white-throated toucanet or greyish-throated toucanet (Aulacorhynchus albivitta) is a n
- Whitefish (fisheries term)Whitefish or white fish is a fisheries term for several species of demersal fish with fins
- WhiteflyFamily of insects
- Wild boarSpecies of mammal
- Wild GameWild Game: My Mother, Her Lover, and Me is a 2019 memoir by American writer Adrienne Brode
- Wilde BeastWilde Beast is a wooden roller coaster located at Canada's Wonderland, in Vaughan, Ontario
- WildebeestGenus of antelope
- Wildlife of GabonThe wildlife of Gabon is composed of its flora and fauna. Gabon is a largely low-lying cou
- Wildlife of NamibiaThe wildlife of Namibia is composed of its flora and fauna. Namibia's endangered species i
- William SharpeyWilliam Sharpey FRS FRSE LLD (1 April 1802 – 11 April 1880) was a Scottish anatomist and p
- William Thomas CalmanWilliam Thomas Calman CB FRSE FRS FLS (29 December 1871 – 29 September 1952) was a Scottis
- WillowGenus of trees
- WinemakingProduction of wine
- WolfSpecies of canine
- WolverineSpecies of the family Mustelidae
- Wood warblerThe wood warbler (Phylloscopus sibilatrix) is a common and widespread leaf warbler which b
- WoodlouseSuborder of terrestrial isopods
- WoodpeckerFamily of birds
- Working catA working cat, also known as a mouser, is type of domestic cat that "works" for its keep b
- WrasseFamily of ray-finned fishes
- WrenFamily of birds