Robert Cameron McEwen (January 5, 1920 – June 15, 1997) was a Republican member of the United States House of Representatives from New York.

McEwen was born on January 5, 1920, in Ogdensburg, St. Lawrence County, New York.

He attended the University of Vermont and the Wharton School of the University of Pennsylvania, He served in the United States Army Air Forces from 1942 to 1946, and attained the rank of Sergeant.

McEwen graduated from Albany Law School in 1947, was admitted to the bar and practiced in Ogdensburg.

In 1981, McEwen was appointed by Ronald Reagan to the International Joint Commission, the United States-Canada body that advises the governments of the respective countries on issues related to boundary waters, and he served until 1989.