凯蒂·莱德基，Kathleen Genevieve Ledecky is an American competitive swimmer. She has won five Olympic gold medals and 15 world championship gold medals, the most in history for a female swimmer. She is the world record holder in the women's 400-, 800-, and 1500-meter freestyle. She also holds the fastest-ever times in the women's 500-, 1000-, and 1650-yard freestyle events.