Mathieu Gilles Marquet (born 11 January 1994) is a Mauritian swimmer.
[7] At the 2011 World Championships in Shanghai, Marquet finished 57th in the 200 metre freestyle in 2:02.41.
[14] In 2019, he represented Mauritius at the 2019 World Aquatics Championships held in Gwangju, South Korea.
[15] In 2019, he also represented Mauritius at the 2019 African Games held in Rabat, Morocco.
[16] At the 2020 Summer Olympics, he competed in the men's 100 metre freestyle event.