Satyu Yamaguti (山口 左仲, Yamaguchi Sachū, 21 April 1894 – 11 March 1976) was a Japanese parasitologist, entomologist, and helminthologist.

Satyu Yamaguti wrote more than 60 scientific papers[1] and, more importantly, several huge monographs which are still in use by scientists all over the world and were cited over 1,000 times each.

He graduated from Okayama Medical College (1918), studied pathology at Tokyo University (1918-1925) and parasitology at the Institut für Tropenkrankheiten in Hamburg, Germany (1925-1926).

He was lecturer in parasitology in Kyoto University (1927-1943), parasitologist at the Naval Institute of Tropical Hygiene in Macassar (then "Celebes" – now Sulawesi, Indonesia) with the Japanese Navy (1943-1944), and special consultant of the Malaria Survey Detachment of the US Army (1946-1950).

A few examples of genera are: Many species were dedicated to Satyu Yamaguti and are generally named yamagutii (List in ION), such as Acleotrema yamagutii , or, more rarely, satyui (List in ION), such as Pseudorhabdosynochus satyui.