Who was the heaviest U.S. president? July 7, 2020 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 first associated with the term “dollar diplomacy”? How many U.S. presidents are buried in Arlington National Cemetery? Who were the Three Stooges? With how many counts of impeachment was President Richard Nixon charged?