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The Province of Terni (Italian: Provincia di Terni) is the smaller of the two provinces in the Umbria region of Italy, comprising one-third of both the area and population of the region. Its capital is the city of Terni. The province came into being in 1927, when it was carved out of the original unitary province of Umbria.

The diocese of Terni-Narni-Amelia (Latin: Dioecesis Interamnensis-Narniensis-Amerina) is a Roman Catholic ecclesiastical territory in Umbria, central Italy. It was created in 1983, when the Diocese of Amelia was united to the Diocese of Terni and Narni. The latter had been in turn created in 1907, when the Diocese of Narni was united to the historical Diocese of Terni.