Jelle Geens (born 26 March 1993) is a Belgian triathlete. Geens placed 38th at the 2016 Olympics. Two years later he won a bronze medal in the mixed team relay event at the 2018 European Triathlon Championships. He studied industrial engineering at Groep T in Leuven.
In 2024, Geens won the Ironman 70.3 World Championship in Taupà Â, passing Olympic silver medallist Hayden Wilde with three kilometres to go.