| Jurisdiction: | Diocese |
| Caltanissetta | |
| Latin: | Dioecesis Calatanisiadensis |
| Country: |  Italy |
| Province: | Agrigento |
| Area Km2: | 1,120 |
| Population: | 166,874 |
| Population As Of: | 2013 |
| Catholics: | 164,000 (est.) |
| Catholics Percent: | 98.3 |
| Parishes: | 56 |
| Denomination: | Catholic Church |
| Rite: | Roman Rite |
| Established: | 25 May 1844 (years ago) |
| Cathedral: | Cattedrale di S. Maria La Nova |
| Priests: | 102 (diocesan) 13 (Religious Orders) |
| Bishop Title: | Bishop |
| Bishop: | Mario Russotto |
| Map: | Diocesi di Caltanissetta.png |
| Website: | www.diocesicaltanissetta.it |
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]