Jim Holt (born 30 October 1954) is an American journalist, popular-science author, and essayist. He has contributed to The New York Times, The New York Times Magazine, The New York Review of Books, The New Yorker, The American Scholar, and Slate. In 1997 he was editor of The New Leader, a political magazine. His book Why Does the World Exist? was a 2013 New York Times bestseller.