Shaine Casas (born December 25, 1999) is an American professional swimmer. He was national champion in the 100-meter backstroke at the 2019 National Championships and the 100-meter butterfly and 200-meter individual medley at the 2022 National Championships. In 2021 he was a three-time NCAA champion, once in the 100-yard backstroke, once in the 200-yard backstroke, and once in the 200-yard individual medley. At the 2021 World Short Course Championships he won a gold medal in the 100-meter backstroke and the 4×50-meter medley relay, a silver medal in the 200-meter backstroke, the 4×100-meter medley relay, and the 4×50-meter mixed medley relay, and a bronze medal as part of the 4×100-meter freestyle relay. In 2022, he won the bronze medal in the 200 metre backstroke at the 2022 World Aquatic