William Windsor may refer to:
- Prince William of Gloucester (1941–1972), grandson of King George V
- William, Prince of Wales (born 1982), elder son of King Charles III
- William de Windsor (–1384), English feudal lord
- Bobby Windsor (born 1948), British rugby union footballer
- William Windsor (goat) (), known as "Billy", a military mascot goat
See also
- Baron Windsor