Dempster McIntosh (17 January 1896 – 6 May 1984) was an American business executive and diplomat, serving as the United States Ambassador to Uruguay, Venezuela, and Colombia.

At age seven, his family moved to Cotuit, Massachusetts, a small fishing village on Cape Cod, where his father was a gardener on the Rothwell estate.

However, Cotuit historian and biographer Albert Crocker Knight, author of McIntosh's biography, From Ocean View Avenue to Embassy Row, has often said that it was the village, with its bustling commerce, rather than Pittsburgh, that sparked Dempster's interest in business.

Now launched into considerable wealth, he and his family, which now contained three daughters, summered in Cotuit at The Pines, a luxury resort located in a historic mansion, which closed in 1958.

[4] In 1953, McIntosh first came into contact with the political elite through his friend and mentor, Pennsylvania Senator James H. Duff, who introduced him to Secretary of State John Foster Dulles and C. Douglas Dillon, a diplomat and New Jersey campaign manager for President Dwight D.