Renchen (Low Alemannic: Renche) is a small city in Baden-Württemberg, Germany, part of the district of Ortenau.

Renchen is located in the foothills of the northern Black Forest at the entrance to the Rench valley at the edge of the Upper Rhine River Plains.

Renchen then received a town charter for the third time in 1950 in recognition of its historic importance.

In Renchen the Offenburger Tageblatt publishes a daily local edition as "Acher-Rench-Zeitung" and the Stattzeitung für Südbaden is an alternative magazine offered in the area.

Renchen likes to call itself the city of Grimmelshausen, as the poet Hans Jakob Christoffel von Grimmelshausen, author of Der Abenteuerliche Simplicissimus Teutsch, served from 1667 until his death in 1676 as the Bishop of Strasbourg's executor in Renchen.