The Anza is a 35-kilometre (22 mi) Alpine torrent of the Ossola in northern Italy. It flows from the glaciers of Monte Rosa through the Valle Anzasca and into the river Toce, of which it is a right tributary.

Anza
Location within NE Piedmont
Location
CountryItaly
Physical characteristics
Source 
 • locationMacugnaga, Belvedere Glacier
 • elevation1,800 m (5,900 ft)
MouthToce
 • coordinates
46°00′53″N 8°16′57″E / 46.0148°N 8.2825°E / 46.0148; 8.2825
Length35 km (22 mi)
Basin features
ProgressionToceLake MaggioreTicinoPoAdriatic Sea

Its own principal tributaries are the Pedriola, the Tambach, the Orlovono and the Quarazza near Macugnaga and the Olocchia at Bannio Anzino.