The Diocese of Vicenza is a Latin diocese of the Catholic Church in Italy. It is located in the region of the Veneto, and is the capital of the Province of Vicenza, approximately 60 km west of Venice, and around 45 km east of Verona. The diocese was in existence before 590. Vicenza was a suffragan of the Patriarchate of Aquileia until 1751. In 1751 it was transferred to the ecclesiastical province of Udine. In 1818, upon the dissolution of the ecclesiastical province of Udine, Vicenza was made it a suffragan of the Patriarchate of Venice.

The Church of St. Mary of Mount Berico is a Roman Catholic and minor basilica in Vicenza, northern Italy. The church is a Marian shrine, and stands at the top of a hill which overlooks the city.