Lorenz Werthmann (1 October 1858 – 10 April 1921) was a German Roman Catholic priest and social worker.

Werthmann was born in Geisenheim and attended high school in Hadamar.

In 1883, Lorenz Werthmann had received the priestly ordination in Rome.

After a short period in Frankfurt, Lorenz Werthmann became the secretary of Bishop Peter Joseph Blum in Limburg an der Lahn.

He received the title of "Pontifical confidential finance officer" and the award "Erzbischhöflicher Ecclesiastic Council".