Costante Girardengo (Italian pronunciation: [koˈstante dʒirarˈdeŋɡo]; 18 March 1893 - 9 February 1978) was an Italian professional road bicycle racer, considered by many to be one of the finest riders in the history of the sport. He was the first rider to be declared a "Campionissimo" or "champion of champions" by the Italian media and fans. At the height of his popularity in the 1920s he was said to be more popular than Mussolini and it was decreed that all express trains should stop in his home town Novi Ligure, an honour only normally awarded to heads of state.