Jonathan Haggerty (born 18 February 1997) is a British professional Muay Thai fighter and kickboxer currently signed with ONE Championship.

Holding wins over Sam-A and Nong-O Gaiyanghadao, Haggerty is considered to be one of the best British Muay Thai fighters of his generation.

Before appearing at Yokkao 31, Haggerty won the WBC Muaythai Super Featherweight International title with a TKO of Isaac Araya.

[14][15] Jonathan Haggerty eventually faced Rodtang in a rematch for the ONE Muay Thai title at ONE Championship: A New Tomorrow on 10 January 2020.

[18] Haggerty was scheduled to face former ONE Flyweight Kickboxing world title challenger Elias Mahmoudi at ONE on TNT 4 on 28 April 2021.

Haggerty faced Arthur Meyer for the ISKA Muay Thai Lightweight World title at Siam Warriors Superfights on 20 November 2021.

[25] Haggerty was expected to face Amir Naseri in a ONE Muay Thai Flyweight Grand Prix alternate bout at ONE on Prime Video 1 on 27 August 2022.

[27] Haggerty revealed that he had been considering a move into MMA with the promotion ahead of his ONE on Prime Video 4 bout, saying "I think that's what they're going to expect me to do like you said, but I feel like the wrestling, the jujitsu, etc, is getting so much better in the UK.

[31] Haggerty faced Nong-O Gaiyanghadao for the ONE Bantamweight Muay Thai World Championship on 22 April 2023 at ONE Fight Night 9.

[36] Haggerty defended his ONE Bantamweight Muay Thai World Championship against Felipe Lobo on 17 February 2024 at ONE Fight Night 19, winning the bout via TKO stoppage in the third round.