Hemenway is an unincorporated community in Ripley County, in the U.S. state of Missouri.
A post office called Hemenway was established in 1907, and remained in operation until 1920. The community was named after James A. Hemenway, a legislator from Indiana, the native state of a first settler. A variant name was "Riga".
Coordinates: 36°32′54″N 90°39′06″W / 36.54833°N 90.65167°W