Shaunae Miller-Uibo (born 15 April 1994) is a Bahamian track and field sprinter who competes in the 200 and 400 metres. She is a two-time Olympic champion after winning the women's 400 metres at the 2016 Rio Olympics and again at the 2020 Tokyo Olympics.
At the World Athletics Championships, Miller-Uibo won silver medals in the 400 m in 2015 and 2019, and a bronze at the 200 m in 2017 when she also placed fourth at her longer distance. In 2022, she won her first world outdoor and indoor 400 m titles. She holds North American records in the 400 m both outdoors and indoors, set in October 2019 and February 2021, respectively. Her marks of 48.36 (improved at the Tokyo Games) and 50.21 seconds place her respectively sixth and joint eighth on the world all-time list. She holds world bests over the 300 metres outdoors and indoors.
At 16 years old, she was the 400 m 2010 World junior champion and took the World youth title a year later. At 19, Miller-Uibo placed fourth in the 200 m at the 2013 World Championships, and then took her first senior medal (a bronze) at the 2014 World Indoor Championships competing at 400 m. She was the 2018 Commonwealth Games 200 m champion and won four Diamond League titles, having secured the 200 m/400 m double in 2017; she owns circuit records in both disciplines.
Miller-Uibo holds the world's fastest women's marks in straight races of 150 m and 200 m. Her personal best of 21.74 s for the 200 m is a Bahamian national record. She won several national titles in both her disciplines and the NCAA Division I indoor title for the Georgia Bulldogs and Lady Bulldogs.