Charles Austin Beard (November 27, 1874 _ September 1, 1948) was an American historian, author with James Harvey Robinson of The Development of Modern Europe (1907). Born in Knightstown, Indiana, he exemplified modern history writing that encompassed all aspects of culture, and tied economics to politics and intellectual life in works like The Economic Origins of Jeffersonian Democracy.

His revisionist study of the conservative interests of the drafters of the United States Constitution (An Economic Interpretation of the Constitution) seemed radical in 1913.

After resigning from Columbia University in World War I, he helped to found the New School for Social Research in New York, and advised on reconstructing Tokyo after the earthquake of 1923.

Beard's reputation still rests on his wide-ranging The Rise of American Civilization (1927) and its two sequels, America in Midpassage (1939), and The American Spirit (1943), all written in collaboration with his wife, Mary Ritter Beard (1876-1958) whose own interests lay in feminism and the labor union movement (Woman as a Force in History, 1946). Together they wrote a popular survey, The Beards: Basic History of the United States.

In his book An Economic Interpretation of the Constitution of the United States he proposes that the US constitution was a product of economic determinism, that it was written to further the interests of its white, land-holding writers. Charles Beard was also critical of Franklin D. Roosevelt's administration, especially in the struggle over the Supreme Court and in Roosevelt's foreign policy. Beard's last work was President Roosevelt and the Coming of the War (1948). He died in New Haven, Connecticut.