- Wall Brown
- Walnut Caterpillar Moth
- Walnut Orbweaver
- Walnut Sphinx
- Wandering Glider
- Wandering Percher
- Wandering Ringtail
- Wapiti
- Warbling White-eye
- Wart-biter
- Wasp Beetle
- Wasp Spider
- Water Pipit
- Waterlily Borer Moth
- Waterlily Leafcutter Moth
- Wattled Jacana
- Waved Sphinx
- Wavy Turban
- Wavy-lined Emerald
- Weaver's Fritillary
- Wedgling Moth
- Welcome Swallow
- West Atlantic Surfclam
- West Coast Lady
- Western Aphideater
- Western Black Widow
- Western Bluebird
- Western Boxelder Bug
- Western Cattle-Egret
- Western Conifer Seed Bug
- Western Diamond-backed Rattlesnake
- Western Earwig
- Western Fence Lizard
- Western Flycatcher
- Western Giant Swallowtail
- Western Gray Squirrel
- Western Grebe
- Western Green Lizard
- Western Gull
- Western Honey Bee
- Western House Martin
- Western Kingbird
- Western Leopard Toad
- Western Marsh Harrier
- Western Meadowlark
- Western Mosquitofish
- Western Polished Lady Beetle
- Western Pondhawk
- Western Pygmy-Blue
- Western Ratsnake
- Western Ribbon Snake
- Western Roe Deer
- Western Sandpiper
- Western Skink
- Western Spiny-tailed Iguana
- Western Spotted Orbweaver
- Western Tanager
- Western Tent Caterpillar Moth
- Western Terrestrial Garter Snake
- Western Tiger Swallowtail
- Western Toad
- Western Warbling Vireo
- Western Whiptail
- Western Willow Spreadwing
- Western Wood-Pewee
- Western Yellow Wagtail
- Western Yellowjacket
- Wetland Giant Wolf Spider
- Whinchat
- Whirlabout
- Whiskered Tern
- Whistling Kite
- White Banded House Jumper
- White Checkered-Skipper
- White Ermine
- White Ibis
- White Italian Snail
- White Peacock
- White Plume Moth
- White Sea Bream
- White Stork
- White Wagtail
- White-backed Woodpecker
- White-banded Crab Spider
- White-banded Fishing Spider
- White-bellied Sea-Eagle
- White-breasted Nuthatch
- White-breasted Waterhen
- White-browed Scrubwren
- White-cheeked Starling
- White-crowned Sparrow
- White-dotted Prominent
- White-eyed Vireo
- White-faced Heron
- White-faced Ibis
- White-faced Meadowhawk
- White-faced Whistling-Duck
- White-lined Sphinx
- White-lipped Snail
- White-margined Burrowing Bug
- White-marked Tussock Moth
- White-necked Jacobin
- White-nosed Coati
- White-plumed Honeyeater
- White-rumped Sandpiper
- White-rumped Shama
- White-spotted Sawyer
- White-striped Black
- White-striped Longtail
- White-tailed Antelope Squirrel
- White-tailed Bumble Bee
- White-tailed Deer
- White-tailed Eagle
- White-tailed Hawk
- White-tailed Jackrabbit
- White-tailed Kite
- White-tailed Skimmer
- White-throated Dipper
- White-throated Kingfisher
- White-throated Magpie-Jay
- White-throated Sparrow
- White-tipped Dove
- White-winged Dove
- White-winged Scoter
- Whooper Swan
- Widow Skimmer
- Wild Boar
- Wild Indigo Duskywing
- Wild Turkey
- Willet
- Willie Wagtail
- Willow Beauty
- Willow Clytra
- Willow Pinecone Gall Midge
- Willow Tit
- Willow Warbler
- Wilson's Phalarope
- Wilson's Snipe
- Wilson's Warbler
- Winter Firefly
- Winter Moth
- Winter Wren
- Witch-hazel Cone Gall Aphid
- Wood Duck
- Wood Frog
- Wood Leopard Moth
- Wood Sandpiper
- Wood Stork
- Wood Thrush
- Woodchat Shrike
- Woodhouse's Scrub-Jay
- Woodhouse's Toad
- Woodland Dor Beetle
- Woodland Skipper
- Woodlouse Spider
- Wool Sower Gall Wasp
- Woolly Sculpin