Karl Bleyl (14 December 1908 – 28 April 1995 in Oranienbaum) was a German entomologist who specialised in Hymenoptera. His collection of Hymenoptera (Apoidea) is held by the German Entomological Institute. His Lepidoptera are in the collection of Thomas Lehmann in Oranienbaum.
- Lehmann, T. 1995: [Bleyl, K.] Naturwiss. Beitr. Mus. Dessau 1995 5-6, Portr.