The individual who holds the record for the most gold medals won in a single Olympics is Michael Phelps. He achieved this remarkable feat at the Beijing 2008 Olympics, where he won a total of 8 gold medals. Phelps's achievements have made him one of the most decorated Olympians in history, with a total of 23 gold medals across his Olympic career. His extraordinary performances in swimming have set numerous world records and inspired future generations of athletes.