Lew Sapieha (Belarusian: Леў Сапега; Lithuanian: Leonas Sapiega; 4 April 1557 – 7 July 1633) was a nobleman and statesman of the Polish–Lithuanian Commonwealth.

[9] He was educated in Leipzig and worked in the royal chancellery of King of Poland and Grand Duke of Lithuania Stephen Báthory under the direction of Jan Zamoyski.

[citation needed] Disillusioned by the squabbles within the Protestant camp, in 1586 he converted with his first wife to Roman Catholicism of which he became a zealous defender.

He also participated in wars with Muscovy under rule of Stephen Báthory and King of Poland and Grand Duke of Lithuania Sigismund III Vasa.

He was co-initiator and a participant in the military expedition to Moscow in 1618 by King of Poland and Grand Duke of Lithuania Władysław IV.