August Gustaw Dehnel s. Michała (June 25, 1903, in Warsaw – November 22, 1962, in Warsaw) was a Polish zoologist, Ph.D. (1926), professor. Until 1949 he signed his popular science and embryology works with the name Gustaw Dehnel. Dehnel was born in Warsaw, the son of Maria née Sliwicka and physician Michael Dehnel. After school he was conscripted and served in Upper Silesia for which he received a medal of valour. He became a student of Jan Korczak Tur in the Institute of Comparative Anatomy from 1922. He obtained his doctorate in 1926 and became a senior assistant. He took an interest in tera