The Diocese of Pistoia is a Latin diocese of the Catholic Church located in the Province of Florence. It has existed since the third century. From 1653 to 1954, the historic diocese was the diocese of Pistoia and Prato. The Diocese of Prato has been separate from 1954. The diocese is a suffragan of the archdiocese of Florence.

The Diocese of Prato is a Latin diocese of the Catholic Church in Tuscany, that has existed as an independent entity since 1954. Its see is Prato Cathedral, some 10 miles (17 km) northwest of Florence, on the Bisenzio River. The diocese is a suffragan of the Archdiocese of Florence.