Yuri II Boleslav (Ukrainian: Юрій-Болеслав Тройденович, romanized: Yurii-Boleslav Troidenovych; Polish: Bolesław Jerzy II; Latin: Georgius; c. 1305/1310 – April 7, 1340), was King of Ruthenia and Dominus of the Galicia–Volhynian lands (1325–1340). He was the son of Trojden I, Duke of Masovia, a member of the Piast dynasty and the grandson of Yuri I of Galicia. His murder prompted a war of succession, known as the Galicia–Volhynia Wars.