Haan is a town in the district of Mettmann, in North Rhine-Westphalia, Germany. It is situated at the western edge of the Bergisches Land, 1…Haan is a town in the district of Mettmann, in North Rhine-Westphalia, Germany. It is situated at the western edge of the Bergisches Land, 12 km southwest of Wuppertal and 17 km east of Düsseldorf. In 1975, Gruiten was incorporated into Haan.