Piruz Nahavandi (, '), also known by the teknonymy Abu Luʼluʼah (, ') and Baba Shuja' al-din (, ""), was a Persian Sasanian soldier who was captured in the Battle of al-Qādisiyyah (or Battle of Nahavand) in 636 CE when the Sasanians were defeated by the Muslim army of Omar on the western bank of the Euphrates River. After he was brought to Arabia as a slave, he managed to assassinate Omar in the Islamic Hijri year 23 (644–645 CE). Nahavandi has been reported to have been an expert blacksmith and carpenter alongside his career as a soldier. His name indicates that he is originally from the ancient city of Nahavand, Persia.