Kirkley Schley Coulter, 65, a retired government official who had extensive experience working for both the legislative and executive branches, died Wednesday at Fairfax Hospital. He had emphysema.

Mr. Coulter was the minority economist of the antitrust and monopoly subcommittee of the Senate Judiciary Committee from 1963 until his retirement in 1973.

He also had started his career on Capitol Hill. He was an aide to Sen. Hugh Butler (R-Neb.) in 1941 and 1942 and then, after serving in the Army Air Force in World War II, he became Sen. Butler's legislative and administrative assistant. He held those positions until 1953.

Mr. Coulter then served for a year as chief clerk of the Senate Committee on Interior and Insular Affairs.

From 1954 to 1955, he was an assistant to the undersecretary of the Interior. His next assignment was in the Office of Territories in Interior, where he was assistant director, deputy director and legislative adviser.

In 1960, Mr. Coulter was named chief of the division of international commercial relations of the U.S. Tarriff Commission. He remained there until he joined the staff of the antitrust and monopoly subcommittee.

A lifelong Republican, Mr. Coulter was a former chairman of the Republican executive committee of Arlington County. He also was a founder and cochairman of Arlintonians for a Better County, a civic group.

Since leaving the government, Mr. Coulter had assisted his wife, the former Irene Pramowska, whom he married in 1945, in editing "Polish Heritage," a monthly magazine. He also had supported publication of an anthology of Polish-American poetry, "Blood of Their Blood." The book appeared under the auspices of the American Council of Polish Cultural Clubs.

Mr. Coulter was born in Nashville, Tenn., and moved to Washington in 1929. He earned bachelor's and master's degrees in economics from American University. He also did graduate work at the University of Wisconsin and Columbia University. He lived in Falls Church.

He was a member of the American Academy of Political Science and the American Economic Association.

In addition to his wife, of Falls Church, survivors include a step-daughter, Barbara Coulter Rich of Washington and Nantucket, Mass., and a brother, David C., of Vienna.