| District: | 4th |
| Predecessor: | Edward H. Kruse |
| Successor: | J. Edward Roush |
| Termend: | January 3, 1971 |
| Termstart: | January 3, 1951 |
| State: | Indiana |
| Office1: | United States Ambassador to Ethiopia |
| Predecessor1: | William O. Hall |
| Successor1: | Arthur W. Hummel Jr. |
| Termstart1: | July 8, 1971 |
| Termend1: | February 12, 1974 |
| Birth Date: | 14 December 1907 |
| Birth Place: | Albion, Indiana, US |
| Death Place: | Fort Wayne, Indiana, US |
| Resting Place: | Greenlawn Memorial Park and Mausoleum in Fort Wayne, Indiana |
| Alma Mater: | Hillsdale College, A.B. George Washington University Law School, J.D. |
| Occupation: | Attorney |
| Party: | Republican |
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. He also served as the United States Ambassador to Ethiopia from 1971 to 1974.
Born in Albion, Indiana, Adair attended grade and high schools in that city. He graduated from Hillsdale College in Michigan, A.B., 1928, and from George Washington University Law School, Washington, D.C., LL.B., 1933.
He was admitted to the Indiana bar in 1933 and commenced the practice of law in Fort Wayne, Indiana. He served as probate commissioner of Allen County, Indiana from 1940 to 1950. 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.
Adair was elected as a Republican from Indiana's 4th congressional district to the Eighty-second and to the nine succeeding Congresses (January 3, 1951 – January 3, 1971). Adair voted in favor of the Civil Rights Acts of 1957,[1] 1960,[2] 1964,[3] and 1968,[4] and the Voting Rights Act of 1965,[5] but voted present on the 24th Amendment to the U.S. Constitution.[6] He was an unsuccessful candidate for reelection in 1970 to the Ninety-second Congress.
He served as the United States Ambassador to Ethiopia from 1971 to 1974 as an appointee of President Richard Nixon.
He resumed the practice of law in Fort Wayne, Indiana, where he resided until his death there, May 5, 1983. He was interred at Greenlawn Memorial Park and Mausoleum in Fort Wayne.
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