Rolla Coral McMillen (October 5, 1880 – May 6, 1961) was a U.S. Representative from Illinois.

McMillen was elected as a Republican to the Seventy-eighth Congress to fill the vacancy caused by the death of William H. Wheat.

He was reelected to the Seventy-ninth, Eightieth, and Eighty-first Congresses, and served from June 13, 1944, to January 3, 1951.

He was interred in Greenwood Cemetery, Decatur, Illinois.

This article incorporates public domain material from the Biographical Directory of the United States Congress