Ralph Duane Homan (November 30, 1928 – May 8, 2013) was an American politician and businessman.

Born near Scotland, South Dakota, on his family's farm, Homan served in the United States Army during the Korean War.

He served in the South Dakota House of Representatives as a Republican from 1983 to 1986, where he represented Mount Vernon, South Dakota.

He died in Sioux Falls, South Dakota.

This South Dakota politician-related article is a stub.