Gustaf Lorentz Munthe (3 July 1896 – 25 November 1962) was a Swedish writer, art historian and art teacher.
He was head of Röhsska Craft Art Museum in Gothenburg from 1924 to 1945 and was also prolific as a writer of the museum's publications.
During World War II, Munthe served as head of the M Group of the intelligence agency C-byrån in Gothenburg during World War II, helping the Norwegian resistance movement.
He served as chairman and was a member of a number of associations, companies, foundations, guilds and societies.