Bartolomeo Ammannati (18 June 1511 – 13 April 1592) was an Italian architect and sculptor, born at Settignano, near Florence. He studied under Baccio Bandinelli and Jacopo Sansovino (assisting on the design of the Library of St. Mark's, the Biblioteca Marciana, Venice) and closely imitated the style of Michelangelo.
He was more distinguished in architecture than in sculpture. He worked in Rome in collaboration with Vignola and Vasari), including designs for the Villa Giulia, but also for works and at Lucca. He labored during 1558–1570, in the refurbishment and enlargement of Pitti Palace, creating the courtyard consisting of three wings with rusticated facades, and one lower portico leading to the amphitheatre in the Boboli Gardens. His design mirrored the appearance of the main external façade of Pitti. He was also named Consul of Accademia delle Arti del Disegno of Florence, which had been founded by the Duke Cosimo I in 1563.