August Thienemann

August Friedrich Thienemann (7 September 1882 in Gotha – 22 April 1960 in Plön) was a German limnologist, zoologist and ecologist. He was an associate Professor of Hydrobiology at the University of Kiel, and director of the former Hydrobiologische Anstalt der Kaiser-Wilhelm-Gesellschaft (now the Max-Planck-Institut für Limnologie) at Plön.

A co-founder of Societas Internationalis Limnologiae, Thienemann is best known for his work on the biology of the Chironomidae, and his contributions to the field of lake typology. One of his more noted students was Carmel Humphries, an Irish expert in Chironomidae.