Yoji Totsuka (?? ??, Totsuka Yoji, March 6, 1942 – July 10, 2008) was a Japanese physicist and Special University Professor, Emeritus, University of Tokyo.
Totsuka died on July 10, 2008 from colorectal cancer.
His doctoral advisor - the Nobel Prize winning physicist Masatoshi Koshiba was told that if Totsuka can extend his lifespan by eighteen months, he must receive the prize.