Sassnitz (German pronunciation:[ˈzasnɪts], before 1993 in German:Saßnitz) is a town on the Jasmund peninsula, Rügen Island, in the Federal State of Mecklenburg-Vorpommern, Germany. The population as of 2012 was 9,498.

It is a well-known seaside resort and port town, and is a gateway to the nearby Jasmund National Park with its unique chalk cliffs. Sassnitz is the home of Rügen's only zoo, the Sassnitz Wildlife Park. The decommissioned British submarine HMS Otus was purchased by a German entrepreneur and towed to Sassnitz to be a floating museum. The Sassnitz area is most popular for its famous chalk rocks (Kreidefelsen), which inspired artists like Caspar David Friedrich.