John Milton Cooper Jr. (born 1940) is an American historian, author, and educator. He specializes in late 19th and early 20th-century American political and diplomatic history with a particular focus on presidential history. His 2009 biography of Woodrow Wilson was a finalist for the Pulitzer Prize, and biographer Patricia O'Toole has called him "the world's greatest authority on Woodrow Wilson." Cooper is Professor Emeritus at the University of Wisconsin-Madison.