The Diocese of Caltanissetta (Latin: Dioecesis Calatanisiadensis) is a Latin Church diocese of the Catholic Church in Sicily, It is a suffragan of the archdiocese of Agrigento.^[1]

Caltanissetta once belonged to the diocese of Girgenti, but was created an episcopal see by Gregory XVI, in 1844. At that time it was a suffragan of the archdiocese of Monreale. The first bishop was Antonio Stromillo.

The immense cavern of Caltabillotta is famous on account of the legend of a great dragon, driven away by the holy hermit Peregrinus when he chose that spot for a life of penance.^[2]

• Antonino Maria Stromillo, C.R. † (20 Jan 1845 – 7 Jan 1858 Died)
• Giovanni Battista Guttadauro di Reburdone † (23 Dec 1858 – 26 Apr 1896 Died)
• Ignazio Zuccaro † (22 Jun 1896 – 30 Apr 1906 Resigned)
• Antonio Augusto Intreccialagli, O.C.D. † (22 May 1907 – 16 Mar 1914) Appointed, Coadjutor Archbishop of Monreale
• Giovanni Jacono † (18 Mar 1921 – 21 Aug 1956 Retired)
• Francesco Monaco † (2 Oct 1956 – 21 Dec 1973 Retired)
• Alfredo Maria Garsia † (21 Dec 1973 – 2 Aug 2003 Retired)
• Mario Russotto (2 Aug 2003–present)

• (in Italian) Official page

 This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Diocese of Caltanissetta". Catholic Encyclopedia. New York: Robert Appleton Company.

37°29′00″N 14°04′00″E / 37.4833°N 14.0667°E / 37.4833; 14.0667