Karl Moriz Diesing (1800–1867) was an Austrian zoologist, specializing in the study of helminthology.

His principal works include Systema Helminthum (2 vols., 1850–1851), and Revision der Nematoden (1861).

In his paper "Versuch einer monographie der Gattung Pentastoma" (Ann. Wien Mus. Naturges. 1836, 1–32) he was the first to establish the distinct nature of the Pentastomida, placing them in a new group which he called Acanthotheca.

Austrian zoologists

Karl Moritz Diesing