UFO: More hard rock than Heavy Metal, but there ain't much for this letter so...
UFO (band) - Wikipedia, the free encyclopedia

VAN HALEN: American Heavy Metal band famous for giving the world one of the most accomplished guitarists in the genre.
Van Halen - Wikipedia, the free encyclopedia
VARDIS: British metal band active during the NWOBHM
Vardis - Wikipedia, the free encyclopedia
VENOM: Seminal Black Metal band who coined the very phrase "black metal"
Venom (band) - Wikipedia, the free encyclopedia
VIRGIN STEELE: American power metal band
Virgin Steele - Wikipedia, the free encyclopedia

WHITESNAKE: Again, you probably wouldn't really call them Heavy Metal, but we're into the letters that have less and less bands assigned to them, so the other spinoff band from Deep Purple, formed by David Coverdale, gets a slot here.
Whitesnake - Wikipedia, the free encyclopedia
WHITE SPIRIT: English Metal band who gave us guitarist Janick Gers, who now plays with Iron Maiden.
White Spirit (band) - Wikipedia, the free encyclopedia
WITCHFINDER GENERAL: English Doom Metal band most famous for dodgy, almost porno album covers!
Witchfinder General (band) - Wikipedia, the free encyclopedia
WITCHFYNDE: Another English metal band, active in the NWOBHM.
Witchfynde - Wikipedia, the free encyclopedia
WRATHCHILD: Not to be confused with an American band of the same name. Glam Metal band from the UK who took their name, obviously, from one of Iron Maiden's early songs.
Wrathchild - Wikipedia, the free encyclopedia