Anton Joseph Weidenbach (9 April 1809 in Linz am Rhein – 21 November 1871 in Wiesbaden) was a German schoolteacher, archivist and historian, who specialized in history of the Rhineland.
From 1825 he attended the teacher's training school in Brühl, and from 1829 to 1835 worked as a schoolteacher in the town of Bacharach.
Afterwards he taught classes at the municipal school in Ahrweiler, where he also worked as city archivist.
With Bonn professors Karl Simrock, Gottfried Kinkel and historian Johann Christian von Stramberg, he maintained frequent correspondence.
Fearing reprisal after suppression of the Hecker uprising, he temporarily fled to Belgium.