Loren Carroll, 74, a retired Foreign Service officer and former newspaper and magazine editor, died Saturday at his home in Chevy Chase after a heart attack.

He was consul general in Palermo, Italy, when he retired in 1964. He then came to the Washington area and edited the Foreign Service Journal for four years.

Mr. Carroll was born in Scanlon, Minn., and grew up in International Falls, Minn. He studied at the University of Chicago while working as a reporter on the old Chicago City News and the Evening Post. He covered the trial of Nathan Leopold and Richard Leob, the "thrill killers" of Bobby Franks in 1924, and became a friend of their lawyers, Clarence Darrow.

In 1933, Mr. Carroll went to Europe, becoming a correspondent for the old International News Service in Paris, where he studied at the Sorbonne. A year later he was named city editor of the European edition of the old New York Herald Tribune, published in Paris.

He returned to this country in 1937 to work in the foreign news department of Newsweek magazine in New York. He became its foreign editor in 1940.

During World War II, Mr. Carroll was chief of the Office of War Information psychological warfare operations in western Europe with head-quarters in London. In the latter part of the war, he was press attache at the American diplomatic mission in Algiers and the American Embassy in Paris.

He rejoined Newsweek as chief of its Paris bureau in 1945, and remained there for six years.

He left journalism to become public affairs officer for the U.S. mission to the North Altantic Treaty Organization, first in London and then in Paris. He was consul general in Quebec for four years before his assignment to Palermo in 1960.

He is survived by his wife, Sheila Baker, of the home; two sons, Alexander and Nicholas, of Chevy Chase, and three sisters, Marion Carroll, Aileen Carroll and Jeanne Kass, all of Western Springs, Ill.