Regan Smith (/ˈreɪɡən/; born February 9, 2002) is an American competitive swimmer. She competed at the 2020 and 2024 Olympic Games and won eight medals, including two golds. Smith also won nine total medals at the World Championships, including five golds. She was the 2019 world champion in the 200 m backstroke and the 2022 world champion in the 100 m backstroke.
Smith is the world record holder in the 100 m backstroke, the world junior record holder in the 100 m backstroke and 200 m backstroke, and the former world record holder in the 200 m backstroke.