The Nordbach is a 1.7 kilometre long, left tributary of the Große Aue in East Westphalian Rödinghausen in the district of Herford in the German state of North Rhine-Westphalia The Nordbach stream rises at a height of 120 m above sea level (NN) in Schwenningdorf.

It discharges into the Große Aue, or Neuer Mühlenbach as it is known in its upper reaches, at a point 82.7 kilometres up the Aue from its mouth.

Their confluence is at 91 m above NN and the stream descends a total of 29 metres.

The Nordbach fed the first natural open-air pool in the parish of Rödinghausen.

Its basin is used as a fish pond today.