Hallig Habel (Danish: Habel, North Frisian: Haabel) is the smallest Hallig in the German Wadden Sea, and is a bird sanctuary. It is administered by the Gröde municipality on the neighbouring island. The surface area of Habel measures 7.4 hectares^[1] with about 655 metres in length, and 100 metres width.

On this island there is an artificial dwelling hill called Norderwarft with a house that hosts an ornithological observatory during the summertime.^[1] A second hill on the southern shore, Süderwarft, was abandoned in the 19th century and was then destroyed by the sea.

Habel is located in Protection Area 1 of the Schleswig Holstein Wadden Sea National Park. The common public must therefore not enter the island.^[2] The island is owned by the state of Schleswig-Holstein and is leased by Verein Jordsand, a non-profit association for environmental protection with its seat in Ahrensburg.^[1] Habel serves as breeding and resting grounds for many species of marine birds like the brant goose^[2] and the Arctic tern.