The Liévin Triathlon and Aquathlon Indoor Festival is a multisport event held indoors at the Arena Stade Couvert in Liévin, Hauts-de-France. Organized by Triathlon Club de Liévin, it combines aquathlon and triathlon in very short formats, with some races lasting around 10 minutes.
The main indoor triathlon follows a tournament structure, progressing through quarter-finals, semi-finals, and finals, resembling a knockout competition more than a long-distance event. The program extends to all levels: open races are available for participants aged 7 to 77, school triathlons are part of the schedule, primary school students can try aquathlons, and social centers have their own aquathlon events. The festival also includes an Indoor Triathlon World Cup featuring elite international athletes, and it resumed after two cancellations because of the health crisis.