The Count's of Falkenstein, were German nobility named after the Burg Falkenstein at Donnersberg in what is now the Rhineland-Palatinate.
In 1255 the family inherited by marriage land from the Count's of Hagen-Münzenberg. In this manner they came to be established in the Frankfurt Rhein-Main Region. At Königstein im Taunus they built their new Castle Burg (Neu-)Falkenstein.
The Falkenstein's als inherited the town of Offenbach am Main from the Count of Münzenberg. They leased the town to the neighbouring town of Frankfurt am Main for 1,000 Gulden.
Count Werner III. von Falkenstein († 1418) was Archbishop of Trier from 1388 until his death in 1418. He is remembered for his provokation against the people of Frankfurt by developing rivalry with that town and Offenbach.
The Falkenstein male line died out with the death of Werner III. in 1418. Their landed estates were inherited by Herren von Eppstein family as well as the Counts von Solms.