ONE Championship is a major combat sports promotion established in 2011 by Chatri Sityodtong and Victor Cui. Starting with mixed martial arts (MMA), it has expanded to include muaythai, kickboxing, and submission grappling. The inaugural event took place on September 3, 2011, at the Singapore Indoor Stadium. ONE Championship has hosted over 200 events throughout Asia, solidifying its presence in the combat sports landscape.
In July 2011, Chatri Sityodtong founded One Fighting Championship to unite Asia's martial arts scene, basing it in Singapore due to its strategic location.
In July 2011, One Championship was founded by Chatri Sityodtong and Victor Cui, aiming to establish a Pan-Asian martial arts promotion.
On September 2011, ONE Championship held its first event at the Singapore Indoor Stadium.
On September 2011, ONE Fighting Championship held its inaugural event, ONE FC: Champion vs. Champion, at the Singapore Indoor Stadium.
In January 2012, ONE signed a 10-year deal with ESPN Star Sports and made its PPV debut at ONE Fighting Championship: Rise of Kings.
In March 2012, ONE FC: War of the Lions featured the promotion's first female MMA fight, with Nicole Chua defeating Jeet Toshi.
On October 2012, at ONE FC: Rise of Kings, Soo Chul Kim became the inaugural ONE Bantamweight World Champion, and Kotetsu Boku became the inaugural ONE Lightweight World Champion.
On February 2013, Honorio Banario defeated Eric Kelly at ONE FC: Return of Warriors to become the inaugural ONE Featherweight World Champion.
On March 2014, Nobutatsu Suzuki defeated Brock Larson at ONE FC: War of Nations to win the inaugural ONE Welterweight World Championship.
In May 2014, former UFC Middleweight Champion Rich Franklin became a vice president of ONE Championship.
In September 2014, Adriano Moraes became the first ONE Flyweight World Champion after submitting Geje Eustaquio at ONE FC: Rise of the Kingdom.
On November 2014, Igor Svirid defeated Leandro Ataides at ONE FC: Battle of the Lions to win the inaugural ONE Middleweight World Championship.
In January 2015, One Fighting Championship rebranded and changed its name to One Championship.
On January 2015, the promotion announced it would be changing its name to "One Championship".
On May 2015, Dejdamrong Sor Amnuaysirichoke defeated Roy Doliguez at ONE: Warrior's Quest to become the first ONE Strawweight World Champion.
On July 2015, ONE held its first Lethwei fight at ONE: Kingdom of Warriors in Yangon, Myanmar, featuring Burmese fighters.
On December 2015, Brandon Vera knocked out Paul Cheng at ONE: Spirit of Champions to become the inaugural ONE Heavyweight World Champion.
From 2015, ONE fights have been broadcast by RCTI and iNews in Indonesia.
On May 2016, at ONE: Ascent to Power, Roger Gracie became the inaugural ONE Light Heavyweight World Champion, and Angela Lee became the inaugural ONE Women's Atomweight World Champion.
On August 2016, ONE Championship held its first grappling tournament, One Grappling Challenge Macao, in Cotai, Macau.
From 2016, ONE fights have been broadcast by Thairath TV in Thailand.
In November 2017, Martin Nguyen became ONE's first simultaneous two-division champion by defeating Eduard Folayang at ONE: Legends of the World.
In 2017, ONE broadcasts on RCTI and iNews in Indonesia ended.
In January 2018, Xiong Jing Nan defeated Tiffany Teo at ONE: Kings of Courage to become the inaugural ONE Women's Strawweight World Champion.
On May 2018, Sam-A Gaiyanghadao defeated Sergio Wielzen at ONE: Unstoppable Dreams for the inaugural ONE Flyweight Muay Thai World Championship.
Since May 2018, ONE events have been broadcast live and free on their apps and YouTube channel in select locations.
On July 2018, Kai Ting Chuang defeated Yodcherry Sityodtong at ONE: Battle for the Heavens for the inaugural ONE Atomweight Kickboxing World Championship.
In October 2018, ONE Championship reached a valuation of over $1 billion.
On October 2018, ONE Championship and UFC finalized the first "trade" in MMA history, with Ben Askren going to UFC and Demetrious Johnson joining ONE.
On December 2018, ONE announced a three-year broadcast deal with Turner Sports in the United States.
From 2018, ONE fights have been broadcast by SCTV and Vidio in Indonesia.
In 2018, Miesha Tate became a vice president of ONE Championship.
In February 2019, Nong-O Gaiyanghadao and Stamp Fairtex claimed the inaugural ONE Bantamweight and Atomweight Muay Thai World Championships, respectively.
In May 2019, Petchdam Petchyindee Academy defeated Elias Mahmoudi at ONE: Warriors of Light for the inaugural ONE Flyweight Kickboxing World Championship.
On September 2019, FITE TV broadcasted ONE's two-part, 100th numbered event, Century.
In November 2020, ONE announced a partnership with Facebook to distribute content on Facebook Watch and IGTV.
From 2020, ONE fights have been broadcast (repeat only) by GTV and iNews in Indonesia.
In December 2021, ONE raised an additional $150 million through an investing round, increasing the company’s valuation to $1.35 billion.
From 2021, ONE fights have been broadcast (repeat only) by GTV and iNews in Indonesia.
In 2021, Miesha Tate left ONE Championship to return to fighting.
On April 2022, 17-year-old Smilla Sundell became the youngest champion in ONE history, defeating Jackie Buntan at ONE 156.
On April 27, 2022, ONE announced a five-year distribution deal with Amazon Prime Video for exclusive broadcast rights in the US and Canada.
On September 29, 2022, ONE announced an exclusive multi-year partnership with beIN Sports to broadcast live events across the Middle East and North Africa.
In October 2022, One Group Holdings changed its legal domicile from Singapore to the Cayman Islands.
On October 2022, at ONE on Prime Video 2, Mikey Musumeci defeated Cleber Souza for the ONE Flyweight Submission Grappling World Championship.
On December 8, 2022, ONE announced its partnership with Tero Entertainment to broadcast ONE Lumpinee from Lumpinee Stadium, Bangkok, via Thailand's Channel 7.
From 2022, ONE fights have been broadcast by Moji (repeat only), SCTV (delayed), Vidio (live), Netverse (live), NET. (delayed), and BTV (repeat only) in Indonesia.
In 2022, One Group Holdings, the parent company of ONE Championship, changed its legal operations from Singapore to the Cayman Islands.
In early 2022, ONE co-founder Victor Cui left the organization to become president and CEO of the Edmonton Elks.
Starting January 20, 2023, ONE Lumpinee (ONE Friday Fights) began broadcasting from Lumpinee Stadium, Bangkok via Thailand's Channel 7.
On March 16, 2023, ONE partnered with Seven Network, airing ONE Fight Night and ONE Friday Fights exclusively for 7plus in Australia.
On May 2023, ONE held its first event in America, ONE Fight Night 10, at the 1stBank Center in Broomfield, Colorado.
On June 22, 2023, it was announced that ONE would be bringing live events to Qatar later in the year.
On December 12, 2023, ONE partnered with Sky Sports to become the exclusive home for ONE Fight Night and ONE Friday Fights in the UK and Ireland.
From 2024, ONE fights have been broadcast by Moji (repeat only, delayed), and Vidio (live) in Indonesia.
In 2024, Forbes valued One Championship at $1.3 billion, ranking it fourth among combat sports promotions.