The Buckener Au (German pronunciation: [ˈbʊkənɐ ˈaʊ̯] ⓘ) is a headstream of the Bünzau in the north German state of Schleswig-Holstein.

The Buckener Au rises southwest of Hohenwestedt.

Near Innien it unites with the Fuhlenau forming the Bünzau.

Heck cattle are grazed in the valley of the Au near Aukrug-Homfeld.

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