Neffelbach is a river of North Rhine-Westphalia, Germany. Its source is located less than 1 km west of Vlatten, 1,5 km east of Hausen, within the area of Heimbach, neaqr the town border to Nideggen. Also the town areas of Zülpich, Vettweiàand Nörvenich are reached. It flows into the Erft within the town area of Kerpen.