Wittdün (Öömrang: Witjdün, Danish: Vitdyn, also Hvidklit) is a municipality on the island of Amrum in the district of Nordfriesland in Schleswig-Holstein, Germany.

It was founded in 1890 as a seaside resort next to a new ferry port connecting the island to mainland Nordfriesland.

The reason for founding this new village was the fear of many islanders of a decline of their Frisian culture due to the influx of tourists from the south.

So, many Amrumers thought that concentrating the emerging seaside tourism in a single village would protect the local community from malign influences.

Until December 31, 2006, the Wittdün municipality, together with Nebel and Norddorf formed the Amt Amrum.