Frank Arnold

Frank Arnold may refer to:


 * Frank Arnold (basketball) (1934–2024), American basketball coach
 * Frank Arnold (director) (born 1938), Australian television director
 * 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
 * Frank Arnold (architect), American architect with many works in Forest Park Southeast Historic District of St. Louis, Missouri