Ken-Ichi Inada (稲田 献一, Inada Ken'ichi, March 8, 1925 – May 17, 2002) was a Japanese economist. Beginning in the 1950s, Inada wrote a number of important papers on welfare economics, economic growth and international trade. His contributions include an early extension of Kenneth Arrow's impossibility theorem on the existence of a social welfare function (1955). Inada's extension of the Stolper–Samuelson theorem to the many-good, many-factor case is also considered as a classic piece in trade theory (1971).