Donald Thomas Critchlow (born May 18, 1948) is a historian and professor of American political history at Arizona State University. He has appeared on C-SPAN, NPR, BBC World News, and many talk radio programs. He has written for The Washington Post, The New York Observer, New York Post, and National Review, and has lectured in Europe, China, and Brazil. He is the current editor-in-chief of the Journal of Policy History published by Cambridge University Press.