Ośno Lubuskie [ˈɔɕnɔ luˈbuskʲɛ] (German: Drossen, Latin: Trosna Neomarchita)[citation needed] is a town in Słubice County, Lubusz Voivodeship, Poland.

[2] In the early Piast period, a fortified settlement existed nearby the present-day town and the area formed part of the Lubusz castellany within the Kingdom of Poland until the mid-13th century.

During the final stages of World War II, the Germans evacuated the town's populace in January 1945.

[2] Due to heavy bombing and battles nearby, the town was left 70% destroyed and on 1 February 1945 it was captured by the Red Army.

[2] The historic name Ośno was restored with the adjective Lubuskie added after the Lubusz Land, in which it is located, to distinguish it from other settlement of the same name.