The Galicia–Volhynia Wars are a series of succession wars, fought in the years 1340–1392 and concerning the succession over the Principality of Galicia–Volhynia (in modern Poland and Ukraine).

After Boleslaw-Yuri II is poisoned by local nobles in 1340, both the Grand Duchy of Lithuania and the Kingdom of Poland advance claims over the principality.

After a prolonged conflict, Galicia–Volhynia is divided between Poland (Galicia) and Lithuania (Volhynia) and the principality ceases to exist as an independent state.

Poland acquires a territory of approximately 52,000 square kilometers (20,000 sq mi) with 200,000 inhabitants.