Klanxbüll (Danish Klangsbøl, North Frisian Klangsbel[2]) is a municipality on the mainland in the northwest corner of Schleswig-Holstein, in Kreis Nordfriesland, Germany.

The village's chronicle goes with dike construction in the region, because only as the area of Klanxbüll was endiked and drained, could houses be built.

In 1566 new dams and dikes were built, making a new polder, the Gotteskoog, reconnecting Klanxbüll and the area around to the mainland; part of this separating sea remains as the Gotteskoogsee lake.

Klanxbüll is the last station on the mainland, before the track reaches Sylt; thus is it for people working in the surrounding countryside and on Sylt an important Park&Ride station (chargeable:; 2.50 euros per day).

Klanxbüll is the setting of the 157th episode of the horror podcast The Magnus Archives, where a fictional disease outbreak takes place.