Johann Conrad Dannhauer (b. at Köndringen (10 m. n. of Freiburg) 24 March 1603; d. at Strasburg 7 November 1666) was an Orthodox Lutheran theologian and teacher of Spener.
Dannhauer began his education in the gymnasium at Strasburg and was the master of a thorough philosophical training before he commenced his theological work in 1624.
Although the judgment of his contemporaries, Bebel, Spener, and others, placed him in the front rank of the theologians of the time, Dannhauer has received scant justice at the hands of posterity.
Spener, in return, seems to have been connected with the preparation of the second edition of the Hodosophia for the press and to have acted as critic of another work of Dannhauer's which has not yet been identified.
The estrangement between the two was apparently caused by Dannhauer's nephew, Balthasar Bebel, who was in control of the theological faculty at Strasburg at the time of the publication of Spener's Pia desideria.