Giacomo Leoni (1686 – June 8, 1746), also known as James Leoni, was an Italian architect, born in Venice. He was a devotee of the work of Florentine Renaissance architect Leon Battista Alberti, who had also been an inspiration for Andrea Palladio. Leoni thus served as a prominent exponent of Palladianism in English architecture, beginning in earnest around 1720. Also loosely referred to as Georgian, this style is rooted in Italian Renaissance architecture.