Mathieu Ostiguy (born January 27, 1997) is a Canadian pair skater.
With partner Justine Brasseur, he placed fourth at the 2016 Youth Olympics in Hamar and seventh at the 2016 World Junior Championships in Debrecen. Brasseur/Ostiguy began skating together in May 2014.
They were coached by Bruno Marcotte, Richard Gauthier, Sylvie Fullum, and Julie Marcotte.
Their partnership ended after the 2016–2017 season.
In spring 2017, Ostiguy teamed up with Chloe Choinard.