Who was the heaviest U.S. president? July 7, 2020October 11, 2011 by Pamela Landy William Howard Taft, at a top weight of 352 pounds was the heaviest U.S. president. Related Answers Which world leaders bore the following nicknames? Who was president when the federal income tax went into effect? Who was the youngest man to become president of the U.S.? Who was first associated with the term “dollar diplomacy”? Who was the first president of the United States? How many U.S. presidents are buried in Arlington National Cemetery?