Hiddensee [ˈhɪdənzeː] is a car-free island in the Baltic Sea, located west of Germany's largest island, Rügen, on the German coast.

The island is located at 54°33' north 13°07' east, and has about 1,300 inhabitants. It was a popular holiday destination for East German tourists during German Democratic Republic (GDR) times and continues to attract tourists today with its natural beauty. It is the location of the University of Greifswald's ornithological station. Gerhart Hauptmann and Walter Felsenstein are buried there.