Wierzbięcin [vjɛʐˈbjɛnt͡ɕin] (German Kochsdorf) is a village in the administrative district of Gmina Trzebiel, within Żary County, Lubusz Voivodeship, in western Poland, close to the German border. It lies approximately 10 kilometres (6 mi) south of Trzebiel, 23 km (14 mi) south-west of Żary, and 64 km (40 mi) south-west of Zielona Góra.

• Territorial changes of Poland after World War II