The Łużyca is a river in the Warta River basin, a right-bank tributary of the Prosna River, 36.69 km long.
It rises near the village of Grójec Mały and runs westward, passing the towns of Złote, Tomczyki (Brąszewice commune), Kurpie, Kuźnica Błońska, Czajków, Kuźnica Grabowska, Kraszewice, and Mączniki, where it flows under provincial road no. 449 and then flows into the Prosna River.