The Diocese of Colle di Val d’Elsa (Latin: Dioecesis Collensis) was a Roman Catholic diocese located in the town of Colle di Val d'Elsa in Tuscany, Italy, in the province of Siena. The diocese was established by Pope Clement VIII on 5 June 1592, in the bull "Cum Super Universas", with territory taken from the Archdiocese of Florence, the Archdiocese of Siena, the Diocese of Fiesole, and the Diocese of Volterra. The new diocese was made a suffragan of the metropolitanate of Florence. On 18 September 1782 the diocese gained additional territory from Diocese of Volterra. In 1986, it was suppressed.
