Bart Aernouts (born 5 June 1984) is a Belgian professional long-distance triathlete. He won a silver medal at the 2018 Ironman World Championship. He also competes in the duathlon, having won the 2010 ITU Duathlon World Championships.
In 2021, Bart Aernouts booked his 9th straight trip to Kona where Ironman World Championship is held every year.