Grebenau (German pronunciation: [ˈɡʁeːbənaʊ̯] ⓘ) is a town in the Vogelsbergkreis in Hesse, Germany.

Lying from 220 to 350 m above sea level, Grebenau is northeast of the Vogelsberg some 26 km northwest of Fulda, at the place where the Schwarza empties into the Jossa, itself a tributary to the Fulda.

Grebenau borders in the north on the town of Alsfeld and the community of Breitenbach am Herzberg (Hersfeld-Rotenburg), in the east on the town of Schlitz, in the south on the town of Lauterbach, and in the west on the community of Schwalmtal, Hesse.

Chairman: Herbert Appel (SPD) (as of municipal elections held on 26 March 2006)