Boleslaw III the Wasteful (Polish: Boleslaw III Rozrzutny; 23 September 1291 – Brieg, 21 April 1352), was a Duke of Legnica, Brzeg (Brieg) from 1296 until 1342, and Duke of Wroclaw from 1296 until 1311.
He was the eldest son of Henry V the Fat, Duke of Legnica and Wroclaw, by his wife Elisabeth, daughter of Boleslaw the Pious, Duke of Greater Poland.