From A Wiki of Ice and Fire
William is a given name in Westeros and may refer to:
- William Mooton, Lord of Maidenpool
- William Tortoll, a knight
- Lord William Baratheon and his son of the same name, characters mentioned in Season 1 of Game of Thrones
- William Flowers, a First Builder of the Night's Watch mentioned in Season 5 of Game of Thrones
- William, a Lannister man-at-arms mentioned in Season 8 of Game of Thrones