Prussia (German: Preußen or Preussen) can mean: Prussia up to 18th century:

Prussians, i.e. Citizens of the former German state of Prussia

Free State of Prussia, a state in Germany (1918-1945) after the abolition of the Kingdom of Prussia

Teutonic State, founded in that region by the Teutonic order

Prussian Army, army of the Kingdom of Prussia

Kingdom of Prussia, a kingdom established in Brandenburg-Prussia (1701-1918)

East Prussia, a province of the Kingdom of Prussia, created by uniting former Ducal Prussia and Warmia in 1773

Old Prussians, extinct Baltic tribes, having lived in that region

Old Prussian language, extinct language of the Old Prussians

Duchy of Prussia, a duchy established in the eastern part of Prussia in 1525

Prussia (region), a historical region along the Baltic Sea, that gave name to the later Kingdom of Prussia

Prussian Navy, navy of the Kingdom of Prussia

West Prussia, a province of the Kingdom of Prussia, annexed from Poland in 1772 (former Royal Prussia)

Prussian Trust, German expellee company

Royal Prussia, a province of the Polish Crown, created by separating Prussia into two parts in 1466

Low Prussian, German dialect in East Prussia

Prussian Confederation, an alliance of German Hanseatic cities in Prussia who rebelled against the Teutonic Knights

West Prussia (region), administrative region of the province of East Prussia (1920-1938) (the other rest of former West Prussia)

Prussian blue (disambiguation)

Preussen (ship), the largest sailing vessel ever built

Province of Prussia, a province of the Kingdom of Prussia, created by uniting East and West Prussia (1824/29-1878)

Posen-West Prussia, a province of the Free State of Prussia (1922-1938) (part of former West Prussia which stayed with Germany)

Prussian Military Academy

High Prussian, German dialect in East Prussia

Preußisch (disambiguation)

Borussia (disambiguation)

Brandenburg-Prussia, a state created by the personal union of the Duchy of Prussia and the Margraviate of Brandenburg