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- (Ketchikan Gateway Borough) Willow Islands
- (Madison County) Wilson Islands
- (Perry County) Windfall Island
- (Madison County) Windfall Islands
- (Sitka City and Borough) Winifred Island
- (Ketchikan Gateway Borough) Winstanley Island
- (Madison County) Woewodski Island
- (Prince of Wales-Hyder Census Area) Wolf Rock
- (Perry County) Woodchoppers Island
- (Sitka City and Borough) Wooden Island
- (Madison County) Woody Island
- (Thomas County) Woronkofski Island
- (Sitka City and Borough) Wrangell Island
- (Thomas County) Wrangell Island
- (Prince of Wales-Hyder Census Area) Wood Islands
- (Kodiak Island Borough) West Amatuli Island
- (Sumter County) West Flank Island
- (Yukon-Koyukuk Census Area) Waite Island
- (Matanuska-Susitna Borough) Waldron Island
- (Campbell County) Walrus Island (historical)
- (Aleutians West Census Area) Walrus Island
- (Dillingham Census Area) Walrus Islands
- (Campbell County) Wanda Island
- (Yukon-Koyukuk Census Area) Wanda Island
- (Yukon-Koyukuk Census Area) Weir Island
- (Yukon-Koyukuk Census Area) Weir Island
- (Sumter County) Weeping Peat Island
- (Fairbanks North Star Borough) Wenrich Island
- (Fairbanks North Star Borough) Westgate
- (Nome Census Area) Whale Island