Siobhan Haughey was born on October 31, 1997 in Hong Kong China. She was born to an Irish father, Darach, and a Chinese mother, Canjo. Siobhan went to the University of Michigan in 2019, majoring in psychology. In 2016 Siobhan helped to lead the Michigan Wolverines swimming and diving team to a title for the first time since 2004, and was also named Swimmer of the Championship at the Big Ten Conference.
In 2016 Siobhan qualified for the 200 meter freestyle and the 200 meter individual medley for the Rio de Janeiro Olympics. At the Olympics Siobhan won her heat for the 200 meter freestyle. She finished sixth in the semifinals and thirteenth overall. Although she didn’t make it to the finals, she was the first Hong Kong swimmer to advance past the heats in the Olympics. At the World Aquatics championship in 2017 Siobhan finished fifth for the 200 -meter freestyle which was the first time that Hong Kong had a swimmer in the long course World Championship meet. The following year Siobhan went back to the World Championship meet and swam her fastest time for the 200 meter freestyle. She swam a 1:54:98 and finished fourth but was .2 shy of getting to the podium. In the Tokyo 2020 Olympics Siobhan won silver for the 200 meter freestyle and the 100 meter freestyle.