Frankenau (German pronunciation: [ˈfʁaŋkə.naʊ] ⓘ) is a small town in Waldeck-Frankenberg district in Hesse, Germany.

Frankenau lies in the Kellerwald range southwest of the Talgang (566 m-high mountain).

It is found on the southern edge of the Kellerwald-Edersee National Park on the upper reaches of the Lorfebach, a tributary to the Eder.

The town of Frankenau consists of the centres of Allendorf, Altenlotheim, Dainrode, Ellershausen and Louisendorf.

The oldest surviving document about Frankenau was issued on 4 April 1266 and affirms the granting of town rights.