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

Naert finished seventh at the 2015 Berlin Marathon and 13th at the 2015 Hamburg Marathon. In 2018, he won the gold medal in the marathon at the European Athletics Championships in Berlin with 2:09:51 for a championship record. 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.

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, in 10th place in the 2020 Summer Olympics in Tokyo, Japan, and, after an offday, in 61st place in the 2024 Summer Olympics in Paris, France.

Statistics International competition Representing 2008European Cross Country ChampionshipsBrussels, Belgium35thU20 Men Individual19:352009European Cross Country ChampionshipsDublin, Ireland40thU23 Men Individual26:262010European Cross Country ChampionshipsAlbufeira, Portugal39thU23 Men Individual25:222011European U23 ChampionshipsOstrava, Czech Republic6th10000 m29:18.73European Cross Country ChampionshipsVelenje, Slovenia14thU23 Men Individual24:052012European ChampionshipsHelsinki, Finland11th10000 m29:02.082013European Team ChampionshipsDublin, Ireland6th3000 m8:20.63European Cross Country ChampionshipsBelgrade, Serbia9thSenior Men Individual29:542014European Team ChampionshipsTallinn, Estonia2nd5000 m14:16.51European ChampionshipsZurich, Switzerland11th10000 m29:04.872015Hamburg MarathonHamburg, Germany13thMarathon2:13:39Berlin MarathonBerlin, Germany7thMarathon2:10:31European Cross Country ChampionshipsHyères, France28thSenior Men Individual30:542016Great Birmingham RunBirmingham, United Kingdom3rdHalf Marathon1:04:24Olympic GamesRio de Janeiro, Brazil22ndMarathon2:14:53Frankfurt MarathonFrankfurt, Germany8thMarathon2:12:272017Rotterdam MarathonRotterdam, Netherlands10thMarathon2:10:16New York City MarathonNew York City, United States8thMarathon2:13:212018World Half Marathon ChampionshipsValencia, Spain22ndHalf Marathon1:01:42European ChampionshipsBerlin, Germany1stMarathon2:09:512019Rotterdam MarathonRotterdam, Netherlands7thMarathon2:07:39Fukuoka MarathonFukuoka, Japan17thMarathon2:15:512020World Half Marathon ChampionshipsGdynia, Poland73rdHalf Marathon1:03:442021Olympic GamesSapporo, Japan10thMarathon2:12:13Valencia MarathonValencia, Spain18thMarathon2:08:412022European ChampionshipsMunich, Germany8thMarathon2:11:282023Rotterdam MarathonRotterdam, Netherlands6thMarathon2:06:56New York City MarathonNew York City, United States5thMarathon2:10:252024Olympic GamesParis, France61stMarathon2:16:552025World ChampionshipsTokyo, Japan17thMarathon2:12:52

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