- Wad Medani virus
- Wallal virus
- Walleye dermal sarcoma virus
- Walleye epidermal hyperplasia
- Walleye epidermal hyperplasia virus 1
- Walleye epidermal hyperplasia virus 2
- Walrus calicivirus
- Wanowrie virus
- Warrego virus
- Wasabi mottle virus
- Watermelon chlorotic stunt virus
- Watermelon curly mottle virus
- Watermelon leaf mottle virus
- Watermelon mosaic virus
- Watermelon mosaic virus 1
- Watermelon mosaic virus 2
- Watermelon silver mottle virus
- Weddel water-borne virus
- Weddel waterborne virus
- Weldona virus
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- Wesselsbron virus
- West Caucasian bat virus
- West Nile virus
- Western equine encephalitis virus
- Western equine encephalomyelitis virus
- Wexford virus
- Whataroa virus
- Wheat American striate mosaic virus
- Wheat chlorotic streak virus
- Wheat dwarf virus
- Wheat eqlid mosaic virus
- Wheat rosette stunt virus
- Wheat spindle streak mosaic virus
- Wheat streak mosaic virus
- Wheat yellow leaf virus
- Wheat yellow mosaic virus
- White bream virus
- White bryony mosaic virus
- White bryony virus
- White clover cryptic virus 1
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- White clover cryptic virus 2
- White clover cryptic virus 3
- White clover mosaic virus
- White lupinrnosaic virus
- White spot syndrome virus
- Whitewater Arroyo virus
- Wild cucumber mosaic virus
- Wild potato mosaic virus
- Wild tomato mosaic virus
- Wildbeest herpesvirus
- Wineberry latent virus
- Winter Vomiting Virus
- Winter wheat mosaic virus
- Winter wheat Russian mosaic virus
- Wiseana cervinata GV
- Wiseana cervinata NPV
- Wiseana signata NPV
- Wiseana signata nucleopolyhedrovirus
- Wiseana umbraculata GV
- Wiseana umbraculata NPV
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- Wissadula mosaic virus
- Wisteria vein mosaic virus
- Witwatersrand virus
- Wongabel virus
- Wongal virus
- Wongorr virus
- Woodchuck hepatitis B virus
- Woodchuck hepatitis virus
- Woodchuck herpesvirus marmota 1
- Woolly monkey hepatitis B virus
- Woolly monkey sarcoma virus
- Wound tumor virus
- WRSV virus
- WVU virus 2937
- WW virus 71 to 212
- Wyeomyia smithii NPV
- Wyeomyia virus
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