The Marconi-class was a class of six ocean-going submarines built for the Regia Marina from 1938 to 1940; derived from the earlier Marcello-class, they sacrificed one deck gun for increased autonomy. As soon as they were commissioned, they were assigned to the Atlantic base of BETASOM at Bordeaux; their activity was overall successful, with one of the class (the Leonardo da Vinci) becoming the most successful Italian submarine in the war, and the most successful non-German submarine overall (with 17 ships and 120.243 GRT sunk). Only one member of the class, the Luigi Torelli, converted into a transport submarine, survived the war, being captured first by the Kriegsmarine after Italy's surrender and then taken over by the IJN after the surrender of Germany.

Pages in category "Marconi Class"