The province of 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.

Umbria is a region of central Italy. It includes Lake Trasimeno and Marmore Falls, and is crossed by the Tiber. It is the only landlocked region on the Apennine Peninsula. The regional capital is Perugia.