Johann Jakob Wirz was a Swiss silkweaver who became known a Theosophist prophet and who with Samuel Heinrich Fröhlich (1803-1857) was one of the founders of the German Nazarener movement which survives today only as the Nazarene Church in Romania with around 1000 members.

His works were published after his death as Jacob Wirz, Ein Zeugnis der Nazarener-Gemeinde von der Entwickelung des Reiches Gottes auf Erden (Barmen, 1862), this was followed by Briefe, letters in three volumes, (Barmen, 1863/1873)