Herdorf () is a town in the district of Altenkirchen, in Rhineland-Palatinate, Germany. It is situated on the river Heller, approx. 20 km south-west of Siegen.
Herdorf is located on the BetzdorfâÂÂHaiger railway (RB96). There also was a service of a branch line from Herdorf via Neunkirchen to Unterwalden which is out of service today.
Herdorf is twinned with: