who is the longest reigning president of all times
SERVING U.S. PRESIDENT. THE LONGEST LIST OF THE LONGEST STUFF AT THE LONGEST DOMAIN NAME AT LONG LAST. Who was the world's longest serving U.S. president? Franklin Delano Roosevelt has the honor of being the longest serving U.S. president. Franklin D. Roosevelt was elected into office on March 04, 1933 and served for four terms, becoming the only president to serve more than two terms.