Legendary American swimmer Michael Phelps is the most successful male Olympian of all time, with 28 Olympic medals. Incredibly, 23 of them are gold medals, which is also the record for most Olympic golds won by a male athlete. Among countries, the United States of America leads the way, having won 2,522 Olympic medals over the years, 1,022 of which were gold - also the most won by a single nation.

Source: Olympics.com