Joni Tuominen (born September 4, 1982) is a Finnish professional ice hockey defenceman who is currently a free agent having last played for Ferencváros in the Erste Liga.
He previously played in Finland for Espoo Blues of the Liiga.
As a free agent, Tuominen opened up to the possibility of playing abroad after ten seasons in Finland, when he accepted a (unsuccessful) try-out with Czech club, HC Olomouc on August 11, 2014.
Instead, he spent the 2014-15 season playing in Germany's DEL2 with Dresdner Eislöwen.