The nation that won the most gold medals in swimming at the 2008 Olympics was the United States, securing a total of 31 gold medals in the swimming events. This achievement showcased the depth of talent within the US swimming team, with notable performances from athletes like Michael Phelps, who won eight gold medals on his own. The dominance of the US in swimming contributed significantly to their overall medal tally at the Beijing Olympics, establishing the country as a powerhouse in aquatic sports.