Regian Eersel (born 16 December 1992) is a Surinamese-Dutch kickboxer currently signed to ONE Championship. He is the current ONE Lightweight Kickboxing and Muay Thai World Champion. He is ranked as the best welterweight in the world by Combat Press as of September 2022, and the second best by Beyond Kick as of October 2022. He has been continually ranked in Combat Press the top 10 since March 2019.