|Was||Runner Athlete Marathon runner Long-distance runner|
|Birth||21 April 1885, Kuopio, Northern Savonia, Eastern Finland Regional State Administrative Agency, Finland|
|Death||15 June 1967, Helsinki, Helsinki sub-region, Uusimaa, Southern Finland Regional State Administrative Agency (aged 82 years)|
Tatu Kolehmainen (21 April 1885 – 15 June 1967) was a Finnish long-distance runner who competed at the 1912 and 1920 Summer Olympics. In 1912 he reached the finals of 10,000 m and marathon races, but failed to finish due to a strong heat. In 1920 he placed 10th in the marathon. His younger brother Hannes competed alongside at the 1912 and 1920 Games.