Shannon Wiratchai (Thai: ชนนภัทร วิรัชชัย; born November 14, 1988) is Thai mixed martial artist who competes in the Featherweight division. He was last signed to ONE Championship, where he also previously competed as a Lightweight.

Wiratchai is a pioneer of mixed martial arts in Thailand, having made his professional debut in 2011. He is also known for his striking ability, holding the organization's record for the second-most knockouts in the ONE lightweight division, as well as the organization's second-fastest finish in lightweight history. ^[2][3][4]

Outside of fighting, he is also an instructor of mixed martial arts and self-defense at the Bangkok Fight Lab.^[31][32]

He took up judo lessons at the age of 8, which helped build his foundation in mixed martial arts. Later on, he also developed a keen interest for Chinese martial arts, particularly baguazhang,^[33] which he would practice at Lumphini Park. Wiratchai has termed his own fighting style the "OneShin Striking System", which is based on "attacking opponents who leave themselves vulnerable". According to Wiratchai, the "OneShin Striking System" incorporates the basics of the striking arts he's learned. It also focuses on five core principles: balance, range, angle, rhythm and execution.^[34][35][36] "My main style is more like an unpredictable striking style," Wiratchai has said, elaborating on his style, "Then I refine my striking with more boxing knowledge. I think my most dangerous weapon may be my right hook. The thing that makes my right hook so strong is because I got no form. I'm just thinking about how to land my hand on the target: How I'm setting up, how I'm moving, how I find the angle, how I move to the goal." While mostly based on striking, this style also incorporates elements of judo and kung fu. When he turned pro in MMA, he later applied elements of Brazilian jiu-jitsu, Muay Thai, boxing and wrestling into his style. Outside of fundamental striking, Wiratchai mostly trains in Brazilian jiu-jitsu and wrestling, holding a black belt in judo and a blue belt in Brazilian jiu-jitsu.

Unlike most Thai fighters, Shannon Wiratchai comes from a well-to-do background. His father is a doctor and his mother is a nurse, both of them working at the King Chulalongkorn Memorial Hospital.^[42] Wiratchai graduated from Chulalongkorn University Demonstration Secondary School. He then went on to complete his college education at Chulalongkorn University. Wiratchai speaks Thai, English and Mandarin Chinese.^[43]

Until 2019, Shannon Wiratchai had been dating Tiger Muay Thai teammate and fellow mixed martial artist Rika Ishige, who competes in ONE Championship's atomweight division.^[44] The two have fought on the same card five times: ONE Championship: Warrior Kingdom^[45] on March 11, 2017 in Bangkok, ONE Championship: Kings and Conquerors on August 5, 2017 in Macau, ONE Championship: Warriors of the World on December 9, 2017 in Bangkok, ONE Championship: Iron Will on March 24, 2018 in Bangkok, and ONE Championship: Clash of Legends^[46] on February 16, 2019 in Bangkok. Wiratchai and Ishige have been referred to as "Thailand's martial arts power couple".^[47]

In 2020, he began dating American-Indonesian yoga instructor Fay Lee Thung. The two married on October 7, 2022.^[48]

• NAKSU
  • 2010 NAKSU Amateur Tournament 75 kg Champion^[49]
• ONE Championship
  • Performance of the Night (One time)
  • 2nd-most knockouts in ONE Lightweight history (4)
  • 2nd-fastest knockout in ONE Lightweight history (0:21)

• List of male mixed martial artists