The Cathedral museum of Prato, Italy was founded in 1967 in a few rooms of the Bishop's residence and in 1976 grew to include items from both the Cathedral of Saint Stephen and the diocesan territory.

Prato is a city and comune in Tuscany, Italy, and is the capital of the Province of Prato. The city lies in the northeast of Tuscany, at an elevation of 65 metres (213 ft), at the foot of Monte Retaia. With 195,213 inhabitants as of 1 January 2023, Prato is Tuscany's second largest city and the third largest in Central Italy.