- Wallcreeper
- Water Pipit
- Water Rail
- West Peruvian Dove
- Western Bluebird
- Western Bonelli's Warbler
- Western Cattle Egret
- Western Grebe
- Western Gull
- Western Jackdaw
- Western Kingbird
- Western Marsh Harrier
- Western Orphean Warbler
- Western Osprey
- Western Sandpiper
- Western Tanager
- Western Wood Pewee
- Western Yellow Wagtail
- Whinchat
- Whiskered Tern
- White-backed Stilt
- White-browed Chat-Tyrant
- White-crowned Sparrow
- White-faced Whistling Duck
- White-rumped Vulture
- White-tailed Tropicbird
- White-throated Sparrow
- White-tufted Grebe
- White-winged Coot
- White Stork
- White Tern
- White Wagtail
- Whooper Swan
- Willet
- Willow Tit
- Willow Warbler
- Wood Duck
- Wood Sandpiper