The Bust of Costanza Bonarelli is a marble sculpture created by Gian Lorenzo Bernini during the 1630's. The piece is now in the Museo Nazionale del Bargello in Florence, Italy. Considered among the most personal of Bernini's works, the bust is of Costanza Piccolomini Bonarelli, the wife of Matteo Bonarelli, who was one of Bernini's disciples and colleagues.