The Duchy of Pomerania (; ; Latin: Ducatus Pomeraniae) was a duchy in Pomerania on the southern coast of the Baltic Sea, ruled by dukes of the House of Pomerania (Griffins). The country existed as a united duchy between years 1121-1160, 1264-1295, 1478-1531, and 1625-1637.

The duchy originated from the realm of Wartislaw I, a Slavic Pomeranian