Boleslaw I Chrobry (aka Bolesław I the Brave or the Valiant) (Czech: Boleslav Chrabrý) (967 – June 17, 1025), in the past also known as Bolesław I the Great (Wielki), is a Duke of Poland in 992–1025 and the first King of Poland from April 19, 1025 until his death.

He also rules as Boleslav IV, Duke of Bohemia during 1002–1003.