ONE Championship: X was a Combat sport event held by ONE Championship on March 26, 2022, at the Singapore Indoor Stadium in Kallang, Singapore.

A ONE Lightweight World Championship rematch between current champion Ok Rae Yoon and former champion (also 2019 ONE Lightweight World Grand Prix Champion) Christian Lee headlined the event. The pairing previously met at ONE: Revolution in September 2021 where Ok defeated Lee by unanimous decision.