Tyler Dennett (June 13, 1883 Spencer, Wisconsin – December 29, 1949 in Princeton, New Jersey) was an American historian and educator, best known for his book John Hay: From Poetry to Politics (1933), which won the 1934 Pulitzer Prize for Biography or Autobiography.
In 1900 Dennett enrolled at Bates College, then transferred to Williams College as a sophomore. After his graduation in the spring of 1904 and a year of work in Williamstown, Massachusetts he attended the Union Theological Seminary, where he was awarded a diploma in 1908. He served briefly as a Congregational Minister before leaving to pursue a career in journalism. In 1922 he published Americans in Eastern Asia, a study of American policy in the Far East, which was well received and was long held as an important work in the field. Dennett published "President Roosevelt's Secret Pact with Japan" in 1924, the subject of which came to be known as the Taft–Katsura Agreement. This paper put forth the thesis that formerly isolationist Japan and the U.S. began to carve up their spheres of influence (which would later become world empires) with this agreement, and it was therefore of first-class importance historically. Later historians questioned this interpretation.
He taught American history at Johns Hopkins University (1923–24) and at Columbia University (1927–28), and international relations at Princeton University (1931–34). Dennett served as president of Williams College (1934–37). resigning after a disagreement with the college's board of trustees.
He died in 1949.
Among his numerous scholarly writings were The Democratic Movement in Asia (1918) and A Better World (1920).
- 'Who's Who of Pulitzer Prize Winners,' pg. 16, 1999
- President Roosevelt's Secret Pact with Japan, Tyler Dennett, The Current History Magazine, October, 1924, 
- The Taft-Katsura Agreement—Reality or Myth?, Raymond A. Esthus, Journal of Modern History 31 (1): 46–51. 1959, JSTOR 
- Williams bio of President Dennett
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