Regan Smith (/ˈreɪɡən/; born February 9, 2002) is an American competitive swimmer who specializes in backstroke and butterfly events.
As a teenager, Smith was regarded as the best American swimmer of her age group. She broke out on the international stage at the 2019 World Championships, winning two gold medals. At the 2020 Olympic Games, Smith won three medals. She then won two gold medals at the 2022 World Championships and five medals, including 1 gold, at the 2023 World Championships. At the 2024 Olympic Games, Smith won five medals, including two golds. She won seven medals, including four golds, at the 2024 Short Course World Championships.
Smith holds the long course world record in the 100 m backstroke and formerly held the record in the 200 m backstroke. She holds the short course world records in the 50 m backstroke, 100 m backstroke, and 200 m backstroke.