Korosnytsia is a village (selo) in Drohobych Raion, Lviv Oblast, in south-west Ukraine. It belongs to Medenychi settlement hromada, one of the hromadas of Ukraine. The community was founded in 1784, and in 2001 had a population of 144. Korosnytsia, originally known as Josefsberg in German and later also as Korosnica in Polish, is located four kilometers from the town of Medenychi and 22 kilometers from Drohobych.