Henry Cushman Breck, an investment banker who aided in United States peace efforts after World War I, died Monday at his home in Barbados, where he had lived in retirement for several years. He was 94 years old.

After having served as a first lieutenant in the United States Army in the war, Mr. Breck was a member of the American financial staff at the Paris Peace Conference in 1919. In the mid-1920's he served with the Dawes Commission, dealing with reparations payments to the Allies by Germany.

A California native and a 1914 graduate of the University of California, he joined the investment banking firm of J. W. Selgman & Company in 1926, eventually becoming a partner and also holding several posts in corporate finance.

Mr. Breck is survived by his son, Henry Reynolds Breck of New York.