Visconte Maggiolo (1478 – after 1549), also spelled Maiollo and Maiolo, was a Genoese cartographer. He was born in Genoa and maybe he was a fellow sailor of explorer Giovanni da Verrazzano. In 1511 he moved to Naples, where he produced three extant nautical atlases. Some historians say that he died of malaria in 1530; but archival documents show that he was still alive, in Genoa, at least in 1549, although he certainly was already dead in 1561.