Kamil Lesniak is a Polish ultra-trail runner who set the course record at the 2026 Quebec Mega Trail QMT135, finishing the 135 km, 6,000-metre-gain route in 16:40:30, 38 minutes faster than the previous mark. He began running marathons at 16 and transitioned to trail events in his early twenties, consistently placing in the top 10 across European and global races.
Lesniak placed 14th at the 2025 UTMB Mont-Blanc in 22:08:47, the best result by a Polish runner in the event's history. The following year he won the Ultra-Trail des Paiens in Alsace in 9:00:39 before traveling to Canada for his Quebec Mega Trail debut. In 2023 he set a supported fastest-known-time on Poland's Glowny Szlak Beskidzki, covering approximately 500 km in 3 days and 21 hours.
Lesniak competes under the Hoka Garmin Team banner and holds an ITRA Performance Index of 883.