Demmin may refer to:
Places Demmin, town in Mecklenburg-Western Pomerania, Germany Demmin (district), Mecklenburg-Western Pomerania, Germany Duchy of Demmin, one of the partitions of the Duchy of Pomerania
People Demmin (surname) Casimir I of Demmin, also known as Casimir I, Duke of Pomerania Casimir II of Demmin, also known as Casimir II, Duke of Pomerania Hans Joachim von Rohr-Demmin (1888-1971), German politician Wartislaw III of Demmin, also known as Wartislaw III, Duke of Pomerania