Giannino "Gio" Castiglioni (4 August 1884 – 27 August 1971) was an Italian architect, urbanist, painter and sculptor. His style was representational. Castiglioni was born in Milan and studied at the Accademia di Brera. He finished his studies there in 1906. From the early 1900s he primarily lived and worked in Lierna, a town on Lake Como. In 1951, he designed the master plan, the square, and several individual buildings in Lierna.