Middleweight Championship: Anatoly Malykhin def. Reinier de Ridder via TKO (Retirement) at 1:16 of R3
Featherweight Championship: Tang Kai def. Thanh Le via TKO (Right Hook to Ground Punches) at 4:48 of R3
Strawweight Championship: Joshua Pacio def. Jarred Brooks via DIsqualification (Spiking Opponent on Head) at :56 of R1
Amir Aliakbari def. Arjan Bhullar via Disqualification (Timidity) at 4:15 of R3
Boxing: Mehdi Zatout def. Zuhayr Al-Qahtani via Unanimous Decision
Muay Thai: Vladimir Kuzmin def. Zafer Sayik via Unanimous Decision
Grappling: Cleber Sousa def. Osamah Almarwai via Submission (Armbar) at 5:31
Muay Thai: Ali Soldoev def. Zakaria El Jamari via KO (Left Hook) at 2:09 of R2
Muay Thai: Shinji Suzuki def. Han Zihao via Unanimous Decision
Keito Yamakita def. Jeremy Miado via Submission (Bulldog Choke) at 4:09 of R1
ONE 166 took place on March 1st, 2024, at the Lusaka Sports Arena in Doha, Qatar.