Satoyasu Iimori (19 October 1885 – 13 October 1982) was a Japanese analytical chemist and a pioneer of radiochemistry. He is so called "the father of radiochemistry in Japan", for his establishment of and contribution to the study of radiochemistry which was not developed at that time in Japan.
He was an honorary research member of the Institute of Physical and Chemical Research (RIKEN) and also an honorary member of the Chemical Society of Japan as well as the Society of the Analytical Chemistry of Japan. After his retirement as a researcher, he became interested in the synthesis of artificial gemstones.