Edwin O. Reischauer, Japanese-American scholar and diplomat, United States Ambassador to Japan (d. 1990)
Edwin Oldfather Reischauer (; October 15, 1910 – September 1, 1990) was an American diplomat, educator, and professor at Harvard University. Born in Tokyo to American educational missionaries, he became a leading scholar of the history and culture of Japan and East Asia. Together with George M. McCune, a scholar of Korea, in 1939 he developed the McCune–Reischauer romanization of the Korean language.

Reischauer became involved in helping create US policy toward East Asia during and after World War II. President John F. Kennedy appointed Reischauer as the United States Ambassador to Japan, where he served from 1961 to 1966. Reischauer founded the Japan Institute at Harvard University in 1973 and was its founding director. It was later named for him.