Constantin Bittoun Kouzmine (born 4 January 1999) is a French tennis player.
Bittoun Kouzmine has a career high ATP singles ranking of 462 achieved on 27 November 2023. He also has a career high ATP doubles ranking of 204 achieved on 20 May 2024.
In August, Bittoun Kouzmine reached his first Challenger doubles final at the 2023 Schwaben Open, partnering with Volodoymyr Uzhylovskyi. The pair lost to Constantin Frantzen and Hendrik Jebens in the final.
In April, Bittoun Kouzmine won his maiden Challenger doubles title at the 2025 Côte d'Ivoire Open II, partnering with Aziz Ouakaa. The pair defeated Aleksandre Bakshi and S D Prajwal Dev in the final.