The Auerbach () is a small river of Hesse, Germany. It is a left and southern tributary of the Kinzig into which it flows in Schlüchtern-Niederzell. It starts from the Schwarzen Born at 428 meters <abbr>above sea level</abbr> south of Schlüchtern - Hohenzell. It flows north-west and into the Schlüchtern district of Niederzell at 191 <abbr>meters above sea level</abbr> from the left into the Kinzig. The river is 5.3 km long and ends 237 meters away from the start of the river. It has a mean bed gradient of about 45%.