Lee Si-hyeong is a South Korean figure skater. He is the 2022 CS Nebelhorn Trophy silver medalist, and a five-time South Korean national medalist. He represented his country at the 2022 Winter Olympics.

The Nebelhorn Trophy is an annual international figure skating competition organized by the Deutsche Eislauf-Union and held in Oberstdorf, Germany. In most years, the event is part of the ISU Challenger Series. The competition is named after the Nebelhorn, a nearby mountain. Medals may be awarded in men's singles, women's singles, pair skating, and ice dance. The Fritz-Geiger-Memorial Trophy is presented to the team with the highest placements across all disciplines.