The Cassero del Sale (Salt Warehouse) is a 13th-century building in Grosseto, Tuscany.

Salt extraction in the area dates back to the 8th century, utilizing the brackish waters of the Lake Prile.

By the early 14th century, salt production had become a major economic driver for the city, with the Sienese establishing control over this profitable trade.

The significant stockpile of salt in Grosseto was so renowned that it was referenced by the poet Cecco Angiolieri in one of his poems.

[2] In the square, the remains of the "new salt warehouse" built by the Sienese in the 14th century to complement the older one are still visible.