| Yuri II Boleslav | |
|---|---|
 | |
| King of Ruthenia | |
| Reign | 1323–1340 |
| Predecessor | Andrew and Leo II of Galicia |
| Successor | Liubartas |
| Born | c. 1305-10 |
| Died | c. 1340 (aged c. 30) |
| Spouse | Eufemia (daughter of Gediminas) |
| House | Piast |
| Father | Trojden I of Masovia |
| Mother | Maria of Galicia |
Yuri II Boleslav (Ukrainian: Юрій-Болеслав Тройденович, romanized: Yurii-Boleslav Troidenovych; Polish: Bolesław Jerzy II; c. 1305/1310 – April 7, 1340), was King of Ruthenia and Dominus of the lands of Galicia–Volhynia (1325–1340). A foreigner and a Catholic by birth, he was the son of Trojden I, Duke of Masovia and a member of the Polish Piast dynasty. Highly unpopular in Orthodox Ruthenia, his murder prompted a war of succession, known as the Galicia–Volhynia Wars.