Below is a list of every Brazilian Muay Thai fighter who has competed under Muay Thai and/or Kickboxing rules in ONE Championship.
| Name | Debut | Event | Opponent |
|---|---|---|---|
| Cosmo Alexandre | April 20, 2018 | ONE: Heroes of Honor | Elliot Compton |
| Walter Goncalves | October 12, 2019 | ONE: Century Part II | Rodtang Jitmuangnon |
| Allycia Rodrigues | August 28, 2020 | ONE: A New Breed | Stamp Fairtex |
| Felipe Lobo | September 18, 2020 | ONE A New Breed III | Yodpanomrung Jitmuangnon |
| Guto Inocente | February 25, 2022 | ONE: Full Circle | Bruno Susano |
| Barbara Aguiar | February 3, 2023 | ONE Friday Fights 3 | Dokmaipa Fairtex |
| Yuly Alves | May 3, 2023 | ONE Friday Fights 7 | Kwanjai KwanjaiMuayThaiGym |
| Noelisson Silva | April 21, 2023 | ONE Friday Fights 19 | Surachai Sor Sommai |
| Dionatha Tobias | May 19, 2023 | ONE Friday Fights 17 | Maisangkum |
| Victor Hugo | May 26, 2023 | ONE Friday Fights 18 | Chanajon PK Saenchai |
| Victor Teixeira | June 9, 2023 | ONE Friday Fights 20 | Kongthailand Kiatnavy |
| Rhuam Felipe Morais | September 8, 2023 | ONE Friday Fights 32 | Kabilan Jelevan |
| Julio Lobo | October 6, 2023 | ONE Friday Fights 36 | Superball Tded99 |
| Fabricio Andrade | November 4, 2023 | ONE Fight Night 16 | Jonathan Haggerty |
| Nicolas Leite Silva | April 6, 2024 | ONE Fight Night 21 | Songchainoi Kiatsongrit |
| John Lineker | September 7, 2024 | ONE 168: Denver | Asa Ten Pow |
| Alber Da Silva | September 2024 | ONE Friday Fights 79 | Muga Seto |
| Gabriele Moram | March 21, 2025 | ONE Friday Fights 101 | Nefise Delikurt |