Carl Gustaf Mannerheim may refer to:
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Carl Gustaf Mannerheim (naturalist) (1797–1854), Finnish entomologist and governor
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Carl Gustaf Emil Mannerheim
Baron Carl Gustaf Emil Mannerheim (, ; 4 June 1867 – 27 January 1951) was a Finnish military leader and statesman. He served as the military leader of the Whites in the Finnish Civil War of 1918, as Regent of Finland (1918–1919), as comma ...
(1867–1951), soldier, statesman, and President of Finland; grandson of the entomologist
{{hndis, Mannerheim, Carl Gustaf