The Valle Spluga or Val San Giacomo (Chiavennasco: Val dei Giüst) is an Alpine valley in the north Italian Province of Sondrio (Lombardy), which extends from the Splügen Pass, on the border with Switzerland, south to Chiavenna. It is the valley of the river Liro.

Panorama of Val San Giacomo with Lake Isola
Flag of Valle Spluga