Johann Firnhaber
Johann Firnhaber is the name of the following people:
- Johann Christian Firnhaber (1753–1828), German musician, composer, pianist, piano teacher and music dealer
- Johann Conrad Firnhaber von Eberstein (1776–1849), Hessian politician and member of parliament in the Grand Duchy of Hesse
- Johann Heinrich Firnhaber (1754–1816), German lawyer, lawyer, notary and writer