Koschmin can refer to
Kreis Koschmin, an administrative district of Prussia Koschmin, now Koźmin, Szamotuły County, a former village of Prussia now in Poland Koschmin, now Koźminek, Lubusz Voivodeship, also a former village of Prussia now in Poland Koschmin, now Koźmin Wielkopolski in Poland; former seat of Kreis Koschmin