Rudolph N. Marginot, 86, a retired government labor adviser and former labor organization official, died of kidney failure Friday in a hospital in Fort Launderdale, Fla.

Mr. Marginot came to Washington in 1942 to work for the appeals board of the old War Production Board. After the war, he was a representative of the American Federation of Labor and then was assistant to the president of the International Brotherhood of Electrical Workers.

From 1954 to 1960, he was an area labor adviser for the Far East with the state Department's Office of Labor Affairs.

He lived in Northern Virginia before retiring to Lauderhill, Fla., in 1960.

Mr. Marginot was a native of Boston, Mass., where he was a mathematics teacher in the public schools for 20 years before coming to Washington. He had attended Northeastern and Harvard universities.

Mr. Marginot's first wife, the Former Mary White, died in 1950. His survivors include his wife of 27 years, Helene T., of Lauderhill, Fla.; three sons by his first marriage, William, of Wheaton, Robert, of Annapolis, and Charles, of Vienna; five daughters by his first marriage, Dorothy Ahern of West Roxbury, Mass., Mildred Grady of Duxbury, Mass., patricia Busi of Bethesda, Phyllis Schmoyer of Warrington, Pa., and Jean Marie Foster of Gaithersburg; a sister, Margaret Dorr of Brockton, Mass.; 34 grandchildren, and 30 great-grandchildren.