Koen Naert (born 3 September 1989) is a Belgian athlete who specializes in cross-country and long-distance running.

His personal best of 2:06:56 comes from the 2023 Rotterdam Marathon, where he placed sixth.

In 2020, he competed in the men's race at the 2020 World Athletics Half Marathon Championships held in Gdynia, Poland.

[3] As a marathon runner, he represented Belgium in 3 successive Summer Olympic Games, finishing in 22nd place in the 2016 Summer Olympics in Rio de Janeiro, Brazil,[4] in 10th place in the 2020 Summer Olympics in Tokyo, Japan,[5] and, after an offday, in 61st place in the 2024 Summer Olympics in Paris, France.

This biographical article relating to Belgian athletics is a stub.