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| Founded | 1973 |
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| Country | Finland |
| Number of teams | 108 |
| Level on pyramid | 4 (1973–2023) 5 (2024–) |
| Promotion to | Kakkonen |
| Relegation to | Nelonen |
| Domestic cup(s) | Finnish Cup |
| Current champions | FC Inter 2 TPV SJK Akatemia/2 EBK VJS JäPS/47 RoPo MyPa JPS |
| Current: 2024 Kolmonen | |
| Finnish football league tiers |
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Kolmonen or III divisioona is the fifth level in the league system of Finnish football and comprises 108 Finnish football teams. The III divisioona was introduced in 1973 and in the mid-1990s became known as the Kolmonen (Number Three in English and Trean in Swedish). Until the end of 2023 season, Kolmonen was the fourth level in the pyramid, but after the creation of new second-tier Ykkösliiga, Kolmonen fell down one level, starting in 2024.