William F. Littlejohn, 88, who helped draft the Federal Classification Act of 1923, an important piece of Civil Service legislation, and who retired from the government in 1952 after more than 30 years of service, died of congestive heart failure Saturday at Loudoun Memorial Hospital in Leesburg.

Mr. Littlejohn was born in Barre, Vt. He graduated from Brown University and was a captain in the infantry in World War I.

He came to Washington in 1919 and went to work for the old Bureau of Efficiency. While there, he worked on the Federal Classification Act, which set guidelines for job classifications in the Civil Service system. He earned a law degree at George Washington University in about 1925.

In 1932, when the Bureau of Efficiency was disbanded, Mr. Littlejohn went to work for the Labor Department. In 1934, he transferred to the Agricultural Resettlement Administration and remained there until 1942.

During World War II, he was with the War Manpower Commission and then with the War Assets Administration. He was on the staff of a Senate committee overseeing the Marshall Plan from 1948 to 1950 and then joined the Treasury Department, from which he retired in 1952.

He was a member of American Legion Post No. 270 in Mclean and of the D.C. and Federal bar associations.

His wife, the farmer Mildred Mae Stow, died in 1940.

Survivors include a daughter, Mildred Atwell, of Fairfax; two sons, William F. Jr., of Mclean, and Norman W., of Sterling Park, Va., 16 grandchildren, and 10 great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Long-Term Care Building Fund, Loudoun Memorial Hospital, 70 West Cornwall St., Leesburg, Va., 22075.