Reiji Okazaki (?? ??, Okazaki Reiji, October 8, 1930 – August 1, 1975) was a pioneer Japanese molecular biologist, known for his research on DNA replication and especially for describing the role of Okazaki fragments along with his wife Tsuneko.
Okazaki was born in Hiroshima, Japan.
He graduated in 1953 from Nagoya University, and worked as a professor there after 1963.
He died of leukemia in 1975 at the age of 44; he had been heavily irradiated in Hiroshima when the first atomic bomb was dropped.