Tyler Dennett (June 13, 1883 Spencer, Wisconsin – December 29, 1949 in Geneva, New York) 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. Dennett was awarded a Ph.D. in history from Johns Hopkins University in 1925 after doing research on Theodore Roosevelt and the Russo-Japanese War. He died in 1949. Among his numerous scholarly writings were The Democratic Movement in Asia (1918) and A Better World (1920).