Scharnitz is a municipality in the district of Innsbruck-Land in the Austrian state of Tyrol. It lies 16.4 kilometres (10.2 mi) north of Innsbruck and 9 kilometres (5.6 mi) from Seefeld in Tirol, on the German border. It is one of the largest municipalities in the area and comprises ten parts: Au, Eisack, Gießenbach, Inrain, Jägerviertel, Oberdorf, Schanz, Schießstand, Siedlung and Unterdorf.
The village was founded in the early Middle Ages and was once an important commercial route between Germany and Italy. Its main source of income is tourism, both in summer and winter.
Scharnitz is the western entry point to the Hinterau valley, where the source of the river Isar is located.