Maximilian Lenz (October 4, 1860 – May 19, 1948, Vienna) was an Austrian painter, graphic artist and sculptor. He studied at the Kunstgewerbeschule in Vienna, then at the Academy of Fine Arts. Lenz was initially a member of the Vienna Künstlerhaus before breaking away with members of the Siebener Club to form the Vienna Secession.

With other members of the Siebener Club, Lenz contributed postcard illustrations for publisher Philipp and Kramer, and later continued to develop his graphic work by producing woodcut and illustrations for the Vienna Secession magazine Ver Sacrum.

During World War I, Lenz created several posters advertising Austro-Hungarian war bonds and eventually rejoined the Künstlerhaus in 1938.