The Province of Posen (; ) was a province of the Kingdom of Prussia from 1848 to 1920. Posen was established in 1848 following the Greater Poland Uprising as a successor to the Grand Duchy of Posen, which in turn was annexed by Prussia in 1815 from Napoleon's Duchy of Warsaw. It became part of the German Empire in 1871. After World War I, Posen was briefly part of the Free State of Prussia within Weimar Germany, but was dissolved in 1920 when most of its territory was ceded to the Second Polish Republic by the Treaty of Versailles, and the remaining German territory was later re-organized into Posen-West Prussia in 1922.
