The Buthier () is a mountain torrent in north-west Italy. A left bank tributary of the Dora Baltea, its entire course lies within the Valpelline, a valley in the region of Aosta Valley.
Course
One branch of the river is formed by the Tsa de Tsan Glacier at an elevation of about ; a second by the Grandes Murailles glacier at about . The river is then dammed to form the Place-Moulin Lake reservoir, after which it passes through the communes of Bionaz, Oyace, Valpelline, Roisan and finally Aosta where it joins the Dora Baltea.
Tributaries The principal tributaries from the left are: Rû Verdonaz Vessonaz; and from the right: Ollomont Artanavaz.
Bridges Pont de Pierre, a Roman bridge from the time of Augustus (r. 30 BC –14 AD)
Notes This article began as a translation from its counterpart in the Italian Wikipedia, specifically from this version