Carl Gustaf Thomson (13 October 1824, in Malmöhus – 20 September 1899, in Lund) was a Swedish entomologist.
Thomson became a student in the University of Lund in 1843, graduated in 1850 and became associate professor of zoology there in 1857.
He was offered the post of Director of the Entomological Museum in Berlin, but he declined.
Carl Gustaf Thomson was the author of Coleoptera Scandinaviae (ten volumes, 1859–68), Skandinaviens inseckta (1862), Scandinavia Hymenoptera (five volumes, 1871–79) and Opuscula Entomologica (22 bands, 1869–97).
[1] He also published descriptions of the insects collected on the voyage of the Fregatten Eugenies (HSwMS Eugenie), the first Swedish vessel to circumnavigate the world, especially in Diptera, species novas, etc.