Sin-Itiro Tomonaga, Japanese physicist and academic, Nobel Prize laureate (b. 1906)

Shinichiro Tomonaga (朝永 振一郎, Tomonaga Shin'ichirō, March 31, 1906 – July 8, 1979), usually cited as Sin-Itiro Tomonaga in English, was a Japanese physicist, influential in the development of quantum electrodynamics, work for which he was jointly awarded the Nobel Prize in Physics in 1965 along with Richard Feynman and Julian Schwinger.