Posen may refer to: Places Europe Poznań (German: Posen), city in Poland Grand Duchy of Posen, autonomous province of Prussia, 1815–1848 Province of Posen, Prussian province, 1848–1918 Posen (region), the south-western part of the Province of Posen Posen-West Prussia, German province, 1922–1938 Reichsgau Posen, occupied in 1939, annexed and directly incorporated into the German Reich United States Posen, Illinois, a village Posen, Washington County, Illinois, an unincorporated community Posen, Michigan Posen Township, Michigan Posen Township, Minnesota Other uses Posen (surname) SMS Posen, a German dreadnaught, 1908–1922 See also Posner (disambiguation) Pozen (disambiguation) Poznań (disambiguation)