Bianca Maria Visconti also known as Bianca Maria Sforza or Blanca Maria was Duchess of Milan from 1450 to 1468 by marriage to Francesco I Sforza. She was regent of Marche during the absence of her spouse in 1448. She served as Regent of the Duchy of Milan during the illness of her spouse in 1462, as well as in 1466, between the death of her spouse and until her son, the new Duke, who was absent, was able to return to Milan to assume power.