Polish 1st Legions Infantry Division (1. Dywizja Piechoty Legionów) was a tactical unit of the Polish Army between the World Wars. Formed on February 20, 1919, partially of veterans of the I Brigade of the Polish Legions, the unit saw extensive action during the Polish-Bolshevik War and World War II. After that the division was moved to the rear and took part in shielding the border with Lithuania during Lucjan Żeligowski's forming of the Central Lithuanian Republic. After the war, the division was partially demobilized and stationed in Wilno as an en cadre divisional core.