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 William "Bubby" Sadler (1909-1987), American Negro league baseball player William George "Bill" Sadler (born1931), Canadian race car designer, electrical and electronics engineer, aviation designer.