Biography Wikipedia
Wikipedia:
John Costello may refer to:
John Costello (baseball) (born 1960), American baseball pitcherJohn A. Costello (1891–1976), Taoiseach of IrelandJohn M. Costello (1903–1976), U.S. Representative from CaliforniaJohn Costello (Medal of Honor recipient) (1850–?), U.S. Navy sailor and Medal of Honor recipient