Frank Arnold may refer to: Frank Arnold (basketball) (born 1934), American basketball coach Frank Arnold (director), director of Australian TV series Frank Arnold (footballer) (1877–1943), Australian rules footballer Frank Arnold (umpire) (1851–1929), American baseball umpire Frank B. Arnold (1839–1890), New York politician Frank D. Arnold, United States Ambassador to El Salvador Frank W. Arnold (1851–1917), American trade union functionary