The 33rd Infantry Division was a reserve infantry division of the Polish Army in the final days of the Second Polish Republic. It was not part of peacetime structure of the army, and was formed on August 24–27, 1939, out of units stationed at military districts I (Warsaw) and III (Grodno). It consisted mainly of Border Protection Corps battalions, together with students of Central Border Protection Corps Officer School (Osowiec) and 32nd Light Artillery from Rembertów.