The country with the highest number of Olympic gold medals in swimming is the United States. Historically, the U.S. has dominated the swimming events at the Summer Olympics, producing legendary swimmers who have achieved significant success. Icons like Michael Phelps and Katie Ledecky have contributed to this impressive medal tally, making the U.S. a powerhouse in this sport. The combination of extensive training programs, facilities, and a strong competitive environment has enabled American swimmers to excel on the world stage.