Juhann Mathieu Begarin (born 7 August 2002) is a French professional basketball player for AS Monaco of the LNB Élite and the EuroLeague.

He joined INSEP, a prestigious sports institute in Paris, and played for affiliated club Centre Fédéral in the Nationale Masculine 1 (NM1), the third-tier league of France.

[7] In the following season, he averaged 11.7 points, 3.5 rebounds and 2.9 assists per game, helping his team earn promotion to the LNB Pro A.

[14] Bégarin represented France at the 2019 FIBA U18 European Championship in Volos, Greece, where he averaged 7.9 points, three rebounds and 1.9 steals per game.

[15] Begarin's older brother, Jessie, has played basketball professionally in France, including in the LNB Pro A, the first-tier league.