Olszyna [ɔlˈʂɨna] (German: Langenöls) is a town in Lubań County, Lower Silesian Voivodeship, in south-western Poland. Its name means "alder wood" in Polish. It is the seat of the administrative district (gmina) called Gmina Olszyna. Prior to 1945 it was in Germany. It received its town charter in 2005.