Carl Gustaf von Mannerheim (August 10, 1797 Lemu–October 9, 1854 Stockholm) was a Finnish entomologist and governor in Viborg province. From 1819 he served as the secretary to the Finnish Minister Secretary of State in Saint Petersburg. In 1833 he was appointed governor of the Vaasa County and soon after of the Viborg and Nyslott County. From 1839 until his death he served as the chief judge of the newly formed Imperial Court of Appeals (“Kayserlichen Hofgerichtes” , hovioikeus) in Viborg. He was decorated with the Cross of the Order of Saint Stanislaus and was made a knight of the Order of Saint Vladimir. He published many papers on Coleoptera and worked on the collections of the natural history museums of Dorpat, Saint-Petersburg and Moscow. His grandson Carl Gustaf Emil Mannerheim (1867–1951) became President of Finland.
Publications
- Mannerheim, C. G. von. 1825. Novae coleopterorum species imperii Rossici incolae descriptae, in Hummel, Essais entomologiques, 1(4):19-41.
- Mannerheim, C. G. von. 1837. Enumération des Buprestides, et description de quelques nouvelles espèces de cette tribu de la famille des Sternoxes, de la collection de M. Le Comte Mannerheim. Bulletin de la Société Impériale des Naturalistes de Moscou 8:1?126.
- Mannerheim, C. G. von. 1837. Mémoire sur quelques genres et espèces de Carabiques
- Mannerheim, C. G. von. 1844.Description de quelques nouvelles espèces de Coléoptères de Finlande
- Mannerheim, C. G. von. 1843.Mémoire sur la récolte d'insectes coléoptères faite en 1842
