Japanese economist and government official who was instrumental in developing the plan that doubled Japan's national income in less than 10 years during the 1960s.

After graduating from Tokyo Imperial University (now the University of Tokyo), Ōkita in 1937 joined the Ministry of Posts as an engineer. He became chief of the research section of the Economic Stabilization Board in 1947, chief of the economic cooperation unit of the Economic Planning Agency (EPA) in 1953, director general of the EPA's planning bureau in 1957, and director general of the EPA's development bureau in 1962. In these posts Ōkita was instrumental in developing the theoretical framework for the economic plan of Prime Minister Ikeda Hayato's (Ikeda Hayato) government (1960–64) that greatly accelerated the economic growth of postwar Japan.

Ōkita became president of the Japan Economic Research Centre in 1964 and served as its chairman from 1973 to 1979. He served as minister of foreign affairs from 1979 to 1980 and subsequently continued to act as one of the leading academic spokesmen for Japan. Among his numerous books on economic planning and development are The Future of Japan's Economy (1960), Economic Planning (1962), Future Vision for the Japanese Economy (1968), and Japan and the World Economy (1975).