Michael Joseph Rossbach (12 February 1842, Heidingsfeld – 8 October 1894, Munich) was a German clinician and pharmacologist.

He studied medicine at the universities of Würzburg, Munich, Berlin and Prague, receiving his doctorate in 1865.

In 1869 he qualified as a lecturer in pharmacology at Würzburg, where in 1874 he became an associate professor.

In 1882 became a full professor of special pathology and therapy and director of the medical clinic at the University of Jena as a successor to Hermann Nothnagel.

[2][3] With Nothnagel, he was co-author of "Handbuch der Arzneimittellehre" (from the 3rd edition onward);[4] a textbook that was translated into English with the title "A treatise on materia medica : (including therapeutics and toxicology)".