Dagebüll (German: [ˈdaːɡəbʏl] ⓘ; Mooring North Frisian: Doogebel; Danish: Dagebøl) is a municipality located at the west coast of Schleswig-Holstein in the Nordfriesland district, Germany.

Dagebüll used to be a Hallig, the oldest houses were built on artificial dwelling hills which in parts can still be seen today.

The district of Kirche (Church; North Frisian: Doogebel Schörk) is situated in the centre of the Dagebüll polder, constituting the core of the former Hallig.

A substantial part of visitors to the islands of Föhr and Amrum will leave the mainland via Dagebüll Hafen.

Not far from the lighthouse, the facilities of the Water and Shipping Administration are situated, where the Hallig railway line Dagebüll–Oland–Langeneß starts on a 900 millimetres narrow gauge causeway.

The ferry terminal provides services to the islands of Föhr and Amrum, also minor freight ships, mussel cutters and other vessels frequent the port.

Since 1929, a small causeway rail connects Dagebüll to the Halligen of Oland and Langeneß across the North Frisian Wadden Sea.

Dagebüll can be reached by car from the south via Husum and Bredstedt and from the east via Niebüll on state roads.

The school features a gymnasium and an outdoor sports field on which TSV Fahretoft/Waygaard's football team has its home matches.