David Mark Chalmers (1927 - 25 October 2020) was an American historian.^[1]

During the Second World War, Chalmers worked for the American army. After the war, he gained his Ph.D. in American history at the University of Rochester.^[1] In 1955, he started working as an assistent professor at the University of Florida. During his long career at the university, he was the chair of the University President's Faculty Educational Policy Group.^[1]

Chalmers was active in the civil rights movement.^[2] He joined the St. Augustine movement in 1964 and was arrested for participating in the protests in St. Augustine, Florida. He was in jail for a week.^[2] He was also active in demonstrations against the Vietnam War.^[2]

In 1965, he published Hooded Americanism: A History of the Ku Klux Klan. It was reprinted several times and became his most popular work.

Chalmers was married to the Canadian Jean McCormick Chalmers.^[1] They had two children.^[1]

• The social and political ideas of the muckrakers (1964)^[3]
• The history of the Standard Oil Company with Ida Minerva Tarbell (1966)
• The muckrake years (1974)
• Neither socialism nor monopoly: Theodore Roosevelt and the decision to regulate the railroads (1976)
• Hooded Americanism: the history of the Ku Klux Klan (1987)
• And the crooked places made straight: the struggle for social change in the 1960s (1991)
• Backfire: how the Ku Klux Klan helped the civil rights movement (2003)