The country with the most Olympic gold medals in swimming is the United States. American swimmers have dominated the sport for decades, producing legendary athletes like Michael Phelps and Katie Ledecky. Phelps, in particular, holds the record for the most medals in Olympic history, with a total of 28 medals, including 23 golds. The United States continues to invest heavily in swimming programs, contributing to its ongoing success in international competitions. Other countries also perform well, but none have surpassed the US in terms of overall gold medals in swimming events.