Robert A. Dallek is an American historian specializing in the presidents of the United States, including Franklin D. Roosevelt, John F. Kennedy, Lyndon B. Johnson, and Richard Nixon.

In 2004, he retired as a history professor at Boston University after previously having taught at Columbia University, the University of California, Los Angeles (UCLA), and Oxford University.

He was awarded the Bancroft Prize for his 1979 book Franklin D. Roosevelt and American Foreign Policy, 1932–1945, as well as other awards for scholarship and teaching.