Osojnica (pronounced [ɔˈsoːi̯nitsa], German: Ossoinitz[2]) is a small settlement on a stream with the same name, a tributary of the Poljane Sora (Slovene: Poljanska Sora), in the hills southwest of Žiri in the Upper Carniola region of Slovenia.

[3] The name Osojnica is derived from the Slovene common noun osoje 'shady side (of a slope)'.

Related names in Slovene ethnic territory include Osojnik, Ossiach (in Austria), and Oseacco (in the Resia Valley in Italy).

[4] Before the Second World War, Osojnica and the surrounding area were part of the Kingdom of Italy.

The Italians built a small barracks in the settlement.