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Duchy of Lubusz Księstwo lubuskie (Polish) Herzogtum Lebus (German) Ducatus Lubucensis (Latin)
1241–1242
The map of the duchies controlled by the Silesian Piast dynasty from 1241 to 1243, including the Duchy of Lubusz in the north-west
Status	District duchy of Poland
Capital	Lubusz (now Lebus)
Official languages	Polish, Latin
Religion	Roman Catholic
Government	Feudal duchy
Duke
• 1241–1242	Mieszko of Lubusz
Historical era	High Middle Ages
• Partition from the Duchy of Silesia	1241
• Incorporation into the Duchy of Silesia	1242
Preceded by Succeeded by Duchy of Silesia Duchy of Silesia
Today part of	Poland Germany

The Duchy of Lubusz^[a] was a short-lived feudal district duchy of medieval Poland in the Lubusz Land. Its capital was Lubusz (now Lebus). It was formed in 1241 from the portion of the territory of the Duchy of Silesia, and existed until 1242, when it was incorporated back into it. Its only ruler was Duke Mieszko of Lubusz of the Silesian Piast dynasty.^[1]

The Duchy of Lubusz was created in 1241, from the portion of the territory of the Duchy of Silesia, with Duke Mieszko of Lubusz becoming its ruler. He was given its territory following the death of his father Henry II the Pious, ruler of Silesia, on 9 April 1241. Mieszko was at the time probably about 14 years old and received those lands temporarily until he would reached adulthood to rule the rest of the Duchy of Silesia together with his older brothers. He died in 1242, and the Duchy of Lubusz was incorporated back into the Duchy of Silesia.^[1]

• 1241–1242: Mieszko of Lubusz