ONE Fight Night 12: Superlek vs. Khalilov was a combat sports event produced by ONE Championship that took place on July 15, 2023, at Lumpinee Boxing Stadium in Bangkok, Thailand.

[1] The pair were previously scheduled to square off at ONE 161 and then ONE Fight Night 8, but were moved to this event due to a change in broadcast commitments.

[4] A ONE Light Heavyweight Kickboxing World Championship bout between current champion Roman Kryklia and Françesko Xhaja was expected to headline the event.

[8] A women's atomweight muay thai bout between former WMC (-45 kg) World champion Phetjeeja Lukjaoporongtom and the reigning ISKA Oriental rules World Super Featherweight (−59 kg) champion Lara Fernandez took place at the event.

[9] At the weigh-ins, Superlek Kiatmuu9, Walter Goncalves and Yuya Wakamatsu missed weight.