Dr. Irwin Morris Tobin, 69, a retired State Department official who specialized in European affairs, died of cancer Oct. 31 at Georgetown University Hospital.

Dr. Tobin, who lived in Bethesda, was born in Boston. He earned a bachelor's degree at Tufts University, a master's degree at Clark University, another master's at the Fletcher School of Law and Diplomacy at Tufts and a doctorate in history at Brown University.

He moved to Washington in 1944 and worked briefly for the Office of War Information. He then joined the Office of Strategic Services, the predecessor of the Central Intelligence Agency, and was stationed in Britain.

In 1945, he joined the State Department's European division in Washington. From 1952 to 1956, he was a first secretary and labor attache in the U.S. embassy in Vienna, and from 1956 to 1958, he held the same post in Bonn.

Dr. Tobin then returned to Washington, spent a year at the National War College and then was assigned to NATO affairs at State. From 1963 to 1965, he was the international affairs adviser in the Office of Science and Technology in the Executive Office of the President.

From 1965 to 1969, he was deputy chief of the U.S. embassy in Belgrade. He returned to State as head of the office of research and analysis for the Soviet Union and Eastern Europe. He held that post until he retired in 1973. After his retirement, Dr. Tobin taught and was a consultant to the Treasury Department.

Survivors include his wife, Rosalyn, of Bethesda; three children, Ruth Joseph, of New Orleans, Deborah Almquist, of Danvers, Mass., and David Tobin, of Washington; a brother, Leon, of Boston, and three grandchildren.