William Flower may refer to:
William Flower (officer of arms) (c. 1498–1588), herald, Norroy King of Arms in the reign of Elizabeth I of England William Flower (martyr), burnt 1555 during the Marian Persecutions William Flower, 1st Baron Castle Durrow (1685–1746), Irish peer and MP for Kilkenny County and Portarlington William Henry Flower (1831–1899), English comparative anatomist and surgeon William Way (c. 1560–1588), alias William Flower, Catholic martyr executed at Kingston upon Thames