ONE 166: Qatar was a combat sport event produced by ONE Championship that took place on March 1, 2024, at Lusail Sports Arena in Lusail, Qatar. A ONE Middleweight World Championship bout between current champion Reinier de Ridder (also former ONE Light Heavyweight World Champion) and the ONE Light Heavyweight and Heavyweight Champion Anatoly Malykhin headlined the event.

Cast

Anatoliy Malykhin

Self

Reinier De Ridder

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Tang Kai

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Thanh Le

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Joshua Pacio

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Jarred Brooks

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Amir Aliakbari

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Arjan Bhullar

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Mehdi Zatout

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Zuhayr Al-Qahtani

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Cleber Sousa

Self