Bailey Wallys Diffie (June 27, 1902 – January 12, 1983) was an American historian and teacher of Latin American and Iberian history who focused on Portuguese maritime and colonial history.
Diffie was born on June 27, 1902, in Detroit, Texas, in the Red River Country.
An early interest in East Asia turned to the Iberian World after taking a Summer course with Edward Everett Dale in 1924.
He wrote several books and articles on Latin American and Iberian history.
He published his historical study Latin American Civilization: Colonial Period in 1945.