| Jurisdiction: | Diocese |
| Timișoara | |
| Latin: | Dioecesis Timisoarensis |
| Local: | Dieceza de Timișoara |
| Country: | Romania |
| Province: | Bucharest |
| Metropolitan: | Roman Catholic Archdiocese of Bucharest |
| Area Km2: | 24,755 |
| Population: | 1,345,576 |
| Population As Of: | 2014 |
| Catholics: | 108,379 |
| Catholics Percent: | 8.1 |
| Denomination: | Roman Catholic |
| Established: | 5 June 1930 |
| Cathedral: | St. George's Cathedral, Timișoara |
| Patron: | Saint George |
| Bishop: | József-Csaba Pál |
| Bishop Title: | Bishop |
| Metro Archbishop: | Ioan Robu |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
| Emeritus Bishops: | Martin Roos |
| Map: | Romanian Roman-Catholic Church map.svg |
| Map Size: | 250px |
The Diocese of Timișoara (Latin: Dioecesis Timisoarensis; Hungarian: Temesvári Római Katolikus Püspökség) is a Latin diocese of the Catholic Church in Romania established on 5 June 1930 by Pope Pius XI. The Diocese of Cenad, corresponding to approximately the same region, had been created in 1030 by Stephen I of Hungary. It is based in Timișoara.
The diocese covers the Romanian Banat - the counties of Timiș, Caraș-Severin, Arad and part of Mehedinți, of which 11.1% are Roman Catholic, with compact concentrations in the Krashovani areas near Reșița and Sânnicolau Mare. A plurality of its adherents are Hungarian, followed by Banat Swabians, Romanians, Banat Bulgarians, Croats, Slovaks and Czechs. It is subordinate to the Bucharest Archdiocese. Since 2018, its bishop is József-Csaba Pál.