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.

The province of Terni has an area of 2,122 km², and a total population of 228,836 (2016). There are 33 comunes in the province.