Joonas Kemppainen (born 7 April 1988) is a Finnish professional ice hockey forward who currently plays for Oulun Kärpät of the Liiga.

Undrafted, Kemppainen played nine seasons in the Finnish Liiga with Ässät, HPK and Oulun Kärpät.

Less than a year after coming to the United States, Kemppainen signed a deal with KHL hockey club Sibir Novosibirsk on 14 May 2016.

[4] Kemppaninen played three seasons with SKA Saint Petersburg before leaving following the 2021–22 campaign to return to his native Finland on a one-year contract with former club, Kärpät of the Liiga, on 27 April 2022.

[5] Kemppainen competed in the 2015 IIHF World Championships, finishing third on Team Finland in scoring in his debut senior tournament.