Val Bognanco (Bognanco Valley) is a valley of the Alps, situated in the Pennine range. The valley is drained by the Bogna, a tributary of the Toce at Domodossola that in turn drains into Lake Maggiore . The west side of the valley is mountain ridge that is attached to the main chain of Pennine Alps at Pizzo di Andolla and stretches from Northwest to Southeast. This ridge separates the Diveria river from Bogna.

Multiple mountains surrounding the valley are higher than 2,500 meters, and include Pizzo Straciugo (2,713 m, 8,901 ft), Cima del Rosso (2,609 m, 8,560 ft), Pizzo Pioltone (2,610 m, 8,560 ft), and Cima d'Azoglio (2,558 m, 8,392 ft).

The ridges around the valley contain multiple passes that used to be important to the economy of the valley in the past, including the Monscera Pass (2,103 m, 6,900 ft) and the Pontimia Pass (2,381 m, 7,812 ft) connecting to Simplon Valley .