2023 Kakkonen

The 2023 Kakkonen was the 51st season of Kakkonen, the third-highest football league in Finland. The season began on 21 April 2023 and ended on 8 October 2023. It was the final season of the Kakkonen serving as the third-tier football league in Finland, following its demotion to fourth-tier.

The three groups winners and the highest-ranked runner up qualified for the Kakkonen Championship play-offs, with the winners (PK-35 Vantaa) and runners-up (JIPPO) being promoted to the 2024 Ykkösliiga.

The second, third, fourth, and fifth-placed teams in each group (minus the highest-ranked runner-up) qualified for the Kakkonen play-offs; the five winners (Atlantis, Klubi 04, PK Keski-Uusimaa, RoPS, and VIFK) joined the highest-ranked runner-up (Jazz Pori), the two losing semi-final teams from the Kakkonen Championship play-offs (EPS and OLS), and the two teams relegated from the 2023 Ykkönen (JJK and KPV) in the 2024 Ykkönen.

The bottom two teams in each group (Futura, Hercules, JBK, PIF, SexyPöxyt, and TiPS) were relegated to the 2024 Kolmonen.

Teams
The league consisted of thirty-six teams (twenty-seven returning from the previous season, six promoted from Kolmonen, and three relegated from Ykkönen), split into three equal groups (A, B, and C).

Kakkonen play-offs
The second to fifth teams in each group (minus the highest ranked runner-up) competed in play-off matches, with the five winners earning promotion to the 2024 Ykkönen.

Kakkonen Championship play-offs
The three group winners and highest ranked runner-up competed in a play-off, with the winner earning promotion to the 2024 Ykkösliiga and the rest qualifying for the 2024 Ykkönen.