Olszyna [ɔlˈʂɨna] (formerly German Erlenholz) is a village in the administrative district of Gmina Trzebiel, within Żary County, Lubusz Voivodeship, in western Poland, close to the German border. It is the site of a major border crossing on the E36 motorway connecting Berlin, Germany with Wrocław and Kraków in Poland.