Warren Stilson Ege, 78, a lawyer here for more than 30 years, died Wednesday at his home in Washington following a stroke.

He came here in 1940 and served during World War II as chief of the legal division in the office of the undersecretary of war and then as a legal adviser at Army Air Force headquarters.

In 1946, Mr. Ege helped form the Washington branch of the Cleveland law firm of Jones, Day, Cockley and Reavis, now Jones, Day, Reavis and Pogue, of Washington, Cleveland and Los Angeles. He retired in 1973.

Mr. Ege was born in Omaha, Neb. During World War I, he served as an officer with the Coast Artillery.

After the war, he earned a degree from Dartmouth College, where he was elected to Phi Beta Kappa. He graduated from Harvard Law School, where he was president of the Harvard Law Review.

He was law clerk to Supreme Court Justice Louis Brandeis in 1924-25, then practiced law in St. Paul, Minn., before returning to Washington in 1940.

He is survived by his wife, the former Martha Knox, of the home.

The family suggests that expressions of sympathy be in the form of contributions to the Needy Sick Fund at Washington Hospital Center.