The Roman Catholic Diocese of Timișoara (Hungarian: Temesvári Római Katolikus Püspökség) is a diocese 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.

The diocese covers the Romanian Banat—the counties of Timiş, Caraş-Severin, Arad and part of Mehedinţi, of which 11.1% are Roman Catholic, with compact concentrations in the Krashovani areas near Reşiţa 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.