Third Legions Infantry Regiment (Polish language: 3. Pulk Piechoty Legionów; 3 pp Leg.) was an infantry unit of Polish Legions in World War I, Polish Army and the Home Army. It existed in 1914–1939 and 1944–1945. In the Second Polish Republic Third Legions Infantry Regiment was at first stationed in the garrisons of Łuków and Grodno. Transferred to Jarosław, it became part of 2nd Legions Infantry Division from Kielce.