Hermann Marx (c.1881 – 24 August 1947) was a German-born British stockbroker, banker, and a noted print and book collector. Marx was born in Germany but emigrated to Britain and became a naturalised British citizen in 1906. He worked first as a stockbroker's clerk for Nelke, Philips & Company before becoming a partner there at age 26. In 1921 he was one of four who formed the merchant bank Cull and Company with the support of Paul Nelke. The firm boasted many wealthy clients in the natural resources sector such as Chester Beatty and Calouste Gulbenkian.