Kazutoshi Mori (? ??, Mori Kazutoshi, born 1958) is a Japanese molecular biologist known for research on unfolded protein response.
He is a professor of Biophysics at the Graduate School of Science, Kyoto University, and shared the 2014 Albert Lasker Basic Medical Research Award with Peter Walter for discoveries concerning the unfolded protein response — an intracellular quality control system that detects harmful misfolded proteins in the endoplasmic reticulum and signals the nucleus to carry out corrective measures.