Łódź Army (Polish: Armia Łódź) was one of the Polish armies that took part in the Invasion of Poland of 1939. It was officially created on 23 March 1939 with the task of filling the gap between Poznań Army in the north and Kraków Army in the south. Commanded by Juliusz Rómmel, it consisted of five infantry divisions and two cavalry brigades with support from the air force.