Gänsewerder is a tiny uninhabited German island in the Schaproder Bodden, a lagoon on the Baltic Sea coast, 400 metres east of the Gellen Peninsula on Hiddensee.

It is part of the Western Pomerania Lagoon Area National Park and is out of bounds to the public.

The surface of Gänsewerder is flat, sandy and damp, and only reeds and small plants grow there.

When the national park was established, Gänsewerder (like the Gellen) was a coastal nesting area for birds, but is no longer.

The island of Fährinsel off Hiddensee, which is inhabited by several species of bird, is managed as one area along with the Gellen and Gänserwerder.