Boleslaw III Wrymouth (also known as Boleslaus III the Wry-mouthed, ) (20 August 1086 – 28 October 1138), was a Prince of Lesser Poland, Silesia and Sandomierz between 1102-1107 and over the whole Poland between 1107-1138. He was the only child of Prince Wladyslaw I Herman and his first wife Judith, daughter of Vratislaus II of Bohemia.