15th "Greater Poland" Infantry Division was a unit of the Polish Army in the interbellum period. Founded on February 17, 1920, and based on the 2nd Greater Poland Rifles Division, it actively participated in the Polish-Soviet War, including the Kiev offensive (1920), and the Battle of Warsaw. After Polish victory, the Division pushed the Red Army out of northern Mazovia. It then fought in the Battle of the Niemen River.