Edwin Ross Adair (December 14, 1907 – May 5, 1983) was an American lawyer and World War II veteran who served ten terms as a U.S. Representative from Indiana from 1951 to 1971.

Born in Albion, Indiana, Adair attended grade and high schools in that city.

During World War II, he was called to active duty as a second lieutenant in the Quartermaster Corps Reserve in September 1941 and served until October 1945.

He received battle stars for the Normandy, Northern France, Ardennes, Rhine and Central European campaigns.

He served as the United States Ambassador to Ethiopia from 1971 to 1974 as an appointee of President Richard Nixon.