Ralph A. Dunn (February 28, 1914 – May 3, 2004) was an American businessman and politician.
Born in Pinckneyville, Illinois, Dunn was a real estate investor and lived in DuQuoin, Illinois. Dunn was also in the concrete business and owned a car dealership. He served as a delegate in the Sixth Illinois Constitutional Convention of 1970. Dunn served in the Illinois House of Representatives from 1973 to 1985 and was a Republican. He then served in the Illinois State Senate from 1985 until 1995. Dunn died in a hospital in DuQuoin, Illinois.