William Sadler may refer to:
- William Sadler (painter) (c.1782–1839), Irish landscape painter
- William Sadler (Medal of Honor) (1854–?), American sailor and Medal of Honor recipient
- William Sadler (actor) (born 1950), American film and television actor
- William S. Sadler (1875–1969), American surgeon and psychiatrist
- Billy Sadler (born 1981), American baseball pitcher
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