Daniel Oliver Newberry, 77, a retired Foreign Service officer and authority on Turkey who was a past editorial board chairman of the Foreign Service Journal, died of cancer Oct. 10 at Georgetown University Hospital. He lived in Bethesda.

As a Foreign Service officer from 1949 to 1985, he spent four tours in Turkey, with stints in Ankara, Adana and Istanbul, where he was consul general from 1981 to 1985.

In retirement, he wrote and lectured on foreign policy and promoted American-Turkish relations. He served on the board of the American Friends of Turkey-American Turkish Council.

At the Foreign Service Journal, Mr. Newberry not only chaired the editorial board and wrote articles, but also edited "The Foreign Service Reader," a collection of its articles. He was a recipient of the journal's highest award.

He had served as a governor and assistant secretary of DACOR (Diplomatic and Consular Officers Retired) and as a member of the board of governors of the American Foreign Service Association. He had served on the peace commission of the Episcopal Diocese of Washington and had chaired its Middle East Committee. He had been a councillor of both the Atlantic Council and the Foreign Policy Association and a member of the Cosmos Club.

Mr. Newberry, a native of Atlanta, was a graduate of Emory University and received a master's degree in international relations from American University. During World War II, he served in the Army as a prisoner-of-war interrogator. He also worked for the E.R. Squibb & Sons pharmaceutical company before joining the Foreign Service.

His first State Department assignment was in Jerusalem. From there, he went on to assignments in Turkey, Laos, Iran, Morocco and Bangladesh, where he served as charge d' affaires from 1972 to 1974. A Turkish area specialist, he held assignments in Washington dealing with Turkey, Iran and Egypt. He also served as head of State's Office of Cultural Affairs and as a public affairs officer with the U.S. mission to the United Nations.

Survivors include his wife, Susanne Davis Newberry, whom he married in 1959 and who lives in Bethesda; a daughter, Susan Annette Newberry of Ithaca, N.Y.; two sons, Daniel Gaylord Scott Newberry of Hood River, Ore., and Tucker Daniel Oliver Newberry of Falls Church; a brother; and two grandsons.