Joel Mäntynen (born 13 January 2002) is a Finnish professional basketball player who plays as a point guard for Karlsruhe Lions in the German ProA.

Mäntynen was born in Kotka, but moved to nearby town of Kouvola when aged 16.

He joined Korikouvot, the reserve team of Kouvot in 2018, competing in second-tier Koripallon I-divisioona.

[2] In August 2024, Mäntynen signed with Slovak champions BK Patrioti Levice in Slovak Basketball League.

[3] Mäntynen has represented Finland at youth national teams, and has played 13 matches for Finland B national team.