Mathias Bay-Smidt (born 19 March 1996) is a Danish badminton player.

[1] In 2014, he won his first senior international title at the Finnish International tournament in the men's doubles event partnered with Frederik Søgaard.

[2] In 2016, he won the Czech International tournament in the mixed doubles event partnered with Alexandra Bøje after fight through the qualification round, with the eight matches played.

[3] Boys' doubles The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018,[4] is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF).

This biographical article relating to Danish badminton is a stub.