Stefan Richarz (25 November 1874 – 13 July 1934) was a German priest, missionary and geologist. Richarz was born in near Cologne, Germany in 1874. He joined the Divine Word Missionaries in 1893 at Steyl, Netherlands. He studied theology in the school of the order Sankt Gabriel in Maria Enzersdorf near Mödling and received his ordination to the priesthood in 1901. Richarz studied geology, paleontology, petrology and chemistry at the University of Vienna and later mineralogy, philosophy and geology at the University of Munich. He received his phD for work with Ernst Weinschenk and Ernst Freiherr Stromer von Reichenbach in 1919 from the University of Munich on basalts from a quarry near Groschlattengrün.