Tetsu Tamura (also known as "S. Tetsu Tamura"; birth name: Satoru Tamura); October 18, 1876 – August 19, 1909) was a Japanese meteorologist and oceanographer, who utilized higher mathematics, active in the United States (U.S. National Weather Service) before Syukuro Manabe (2021 Nobel Prize in Physics) and Japan during the Meiji era. Tamura helped Cleveland Abbe (head of the NWS) as his assistant specialized in physico-mathematical theory for three years (1903 – 1906) until his returning to Japan and frequently published articles to Science magazine, Weekly Weather Review, etc. as listed below. He was also a pedagogist of the comparative educational system. He taught at the Naval War College, Tokyo Higher Normal School (now University of Tsukuba), and Waseda University.