John Chamberlain McClintock, 67, an authority on Latin American affairs and a retired executive ofthe United Fruit Co., died of cancer Tuesday at his home in Alexandria.

During the 1940s, he had served as assistant coordinator to Nelson Rockefeller, when Rockefeller was cordinator of the Office of Inter-American Affairs and then as assistant to Rockefeller when the latter became assistant secretary of State for Inter-American Affairs.

During those years, Mr. McClintock also have been vice president ofthe Institute of Inter-American Affairs and executive secretary of the Inter-American Development Commission.

Mr. McClintock left government service in 1945 to work as a private consultant on Latin America.

In 1950, he joined the United Fruit Co. in Boston and became vice president of the organization. Nine years later, after suffering injuries in a bad fall in Latin America, he retired from United Fruit.

Before retirement, Mr. McClintock had served with the National Defense Executive Reserve in the State Department. He also was a member of the board of trustees of the United States Inter-American Council.

Several years after leaving United Fruit, he worked for a period as a consultant to the Inter-American Development Bank.

Bron in Seattle, Wash., Mr. McClintock graduated from Stanford University, where he was elected to Phi Beta Kappa. From 1930 to 1938, he was assistant general passenger agent for Matson Navigation Co. in San Francisco.

He had specialized in Latin American history in school spent two years in South America after college. He left Matson to run his own successful developmetn business in South America, before joining the Bureau of Foreign and Domestic Commerce here in 1939. He also was an adviser on Latin Ameican affairs to the Secretary of Commerce.

He moved to the office of the coordinator of latin America affairs in19. He became a member of numerous organizations in his field.

His wife, Frances, who also was active in national an international affairs, died of cancer Feb. 5.

He is survived by five children, John M., of Baltimore, Deborah Vitek, of Alexandria, Susan Vas Dias, of London, England, R. Michael. of Alexandria and The Hague, and Lucia Payne, of Fairfield, Conn.; a sister, Betty Kirby, of Pasadena, Calif, and seven grandchildren.