The Kladno Marathon () is an annual road marathon held in the city of Kladno in the Czech Republic each September. It was founded in 2002. Runners such as Vlastimil Zwiefelhofer have taken part in the race.
The inaugural marathon was held in 2002. In 2020, a runner representing a running club from outside the Czech Republic won the race for the first time, as Italian Federico Bordignon won the men's race.
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