The Old Fortress of Livorno is a castle in Livorno, Italy. The Old Fortress is a successor building to a medieval fort built by the city of Pisa in the location of an older keep built by Countess Matilda of Tuscany in the 11th century. The 11th century tower was incorporated inside the fort built by the Pisans. The castle has been described as a "symbol of Medicean Livorno". The fort is located at the Medicean Darsena, or old dock of the port of Livorno, built by the Medici family. The ceremony proclaiming Livorno a city took place inside the fortress on 19 March 1606.

Livorno is a port city on the Ligurian Sea on the western coast of the Tuscany region, Italy. It is the capital of the Province of Livorno, having a population of 158,493 residents in December 2017. It is traditionally known in English as Leghorn.