The most amount of gold medals ever won at a single Olympic swimming competition was 8, and it was done by Michael Phelps of the US at the Beijing 2008 summer Olympics.
Michael Phelps holds the record for the most Olympic gold medals in swimming. He has won eighteen so far, including eight from the 2008 Beijing Olympics.
Michael Phelps with 8 medals.
No it is not, The Olympics are won and given to the country who bided the most for it.
There is no "winning country" in the Olympics. The games celebrate human achievement not national achievement. That being said, the US has won the most medals overall in all of the Olympics, Canada may well have won the most Gold Medals in a Winter Olympics and the US may well have won the most medals of any type in any of the Winter Olympics. I don't know which country has won the most Golds and most medals overall in the Summer Olympics.
Swimming because there are several events.
Michael Phelps (8).
The country with the most gold medals at the Rio 2016 Olympics was the United States with 46 total.
If you are referring to the Olympics, then the United States is the country with the most medals, followed by Russia.