Duchy of Lubusz

{{Short description|Former duchy in Poland}}

{{refimprove|date=February 2024}}

{{Infobox country

|native_name = {{native name|pl|Księstwo lubuskie}}
{{native name|de|Herzogtum Lebus}}
{{native name|la|Ducatus Lubucensis}}

|conventional_long_name = Duchy of Lubusz

|common_name =

|era = High Middle Ages

|status = District duchy of Poland

|government_type = Feudal duchy

|life_span = 1241–1242

|event_start = Partition from the Duchy of Silesia

|date_start = 1241

|event_end = Incorporation into the Duchy of Silesia

|date_end = 1242

|p1 = Duchy of Silesia

|flag_p1 =

|border_p1 =

|s1 = Duchy of Silesia

|flag_s1 =

|border_s1 = no

|religion = Roman Catholic

|image_flag =

|flag_type =

|flag_border =

|image_coat =

|alt_coat =

|image_map = Śląsk 1241-1243.png

|image_map_caption = The map of the duchies controlled by the Silesian Piast dynasty from 1241 to 1243, including the Duchy of Lubusz in the north-west

|capital = Lubusz (now Lebus)

|today = Poland
Germany

|official_languages = Polish, Latin

|title_leader = Duke

|leader1 = Mieszko of Lubusz

|year_leader1 = 1241–1242

}}

The Duchy of Lubusz{{efn|Polish: Księstwo lubuskie; German: Herzogtum Lebus; Latin: Ducatus Lubucensis}} 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.