Bianca Mosca, born Bianca Lea Rosa Mottironi, was a London-based fashion designer who rose to prominence during the 1940s and was the only woman member of the Incorporated Society of London Fashion Designers (IncSoc), which represented the interests of the British couture industry. In her heyday she was described as "one of the big 10 of the British fashion world", the others being Digby Morton, Norman Harnell, Charles Creed, Molyneux, Worth, Mattli, Victor Stiebl, Hardy Amies, and Peter Russell. Her firm closed in 1949, a year before her death.