Philip Austin Mangano, 70, a retired Foreign Service Officer and professor of political science at the U.S. Naval Academy at Annapolis, died Tuesday at Sibley Memorial Hospital after a stroke.

Born in Richmond Hill, N.Y., Mr. Mangano attended secondary schools in Rome and Paris. He graduated from Yale University in 1932 and earned a master's degree in political science from the University of Rochester in 1934. In 1967, he earned a law degree from George Washington University.

He taught foreign languages in New England prepatory schools and lectured in history at American University before joining the State Department here in 1940.

During World War II, he served in the Italian section of the Office of Strategic Services here and in Italy.

After the war, he resumed his career at State. He was assigned to the International Organizations Division, where he was deputy U.S. repesentative to a U.N. special committee on the Balkans. He was a consular and political officer at U.S. delegations in Greece, Israel and Tunisia before retiring in 1962.

Mr. Mangano then became a professor of international relations at the Naval Academy. He retired a second time in 1978

Mr. Mangano, who lived in Bethesda, was a member and former vice chairman of the board of trustees of the American University in Rome and a member of the Yale Club, the American Foreign Service Association, and the University Club of Washington.

His marriage to the former Mollie Slaughter ended in divorce.

Survivors include two daughters, Marilinne M. Carroll, and Kathryn M. Harris, and a brother, Richard F. Mangano, and four grandchildren, all of Scottsdale, Ariz.

The family suggests that expressions of sympathy be in the form of contributions in Mr. Mangano's name to the scholarship fund at Yale Universtiy.