
The year 2012 is the 2nd year in the history of the ONE Championship, a mixed martial arts promotion based in Singapore.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

Jewels 18th Ring was a mixed martial arts (MMA) event held by promotion Jewels on March 3, 2012 at Shin-Kiba 1st Ring in Koto, Tokyo, Japan.

Strikeforce: Barnett vs. Cormier was a mixed martial arts event held by Strikeforce. It took place on May 19, 2012 at the HP Pavilion in San Jose, California.

Strikeforce: Cormier vs. Mir was a planned mixed martial arts event that was to be held by Strikeforce. The event was scheduled to take place on November 3, 2012 at the Chesapeake Energy Arena in Oklahoma City, Oklahoma.
Strikeforce: Melendez vs. Healy was a planned mixed martial arts event that was to be held by Strikeforce. The event would have taken place on September 29, 2012 at the Power Balance Pavilion in Sacramento, California.

Strikeforce: Rockhold vs. Jardine was a mixed martial arts event held by Strikeforce. The event took place on January 7, 2012 at the Hard Rock Hotel and Casino in Las Vegas, Nevada.

Strikeforce: Rockhold vs. Kennedy was a mixed martial arts event held by Strikeforce. The event took place on July 14, 2012 at the Rose Garden in Portland, Oregon.

Strikeforce: Rousey vs. Kaufman was a mixed martial arts event held by Strikeforce. The event took place on August 18, 2012, at the Valley View Casino Center in San Diego, California. It was broadcast live on Showtime and Showtime Extreme.

Strikeforce: Tate vs. Rousey was a mixed martial arts event that was held by Strikeforce. It took place on March 3, 2012 at the Nationwide Arena in Columbus, Ohio, United States.

UFC 142: Aldo vs. Mendes was a mixed martial arts event held by the Ultimate Fighting Championship on January 14, 2012 at the HSBC Arena in Rio de Janeiro, Brazil. It was the first UFC event of the year, and was broadcast live on pay-per-view in North America.

UFC 143: Diaz vs. Condit was a mixed martial arts event organized by Ultimate Fighting Championship on February 4, 2012 at the Mandalay Bay Events Center in Las Vegas, Nevada.

UFC 144: Edgar vs. Henderson was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on February 26, 2012 at the Saitama Super Arena in Saitama, Japan.

UFC 145: Jones vs. Evans was a mixed martial arts event held by the Ultimate Fighting Championship. It was the 9th UFC event of the year, and took place on April 21, 2012 at the Philips Arena in Atlanta, Georgia.

UFC 146: dos Santos vs. Mir was a mixed martial arts (MMA) pay-per-view event (PPV) promoted by the Ultimate Fighting Championship (UFC) on May 26, 2012 at the MGM Grand Garden Arena in Las Vegas, Nevada. The main card featured five MMA bouts which were shown on PPV, as well as seven preliminary bouts which were shown on FX, and Facebook. This was the first time in UFC history that the main card featured all heavyweight bouts. It was the twelfth UFC event of 2012.

UFC 147: Silva vs. Franklin II was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on June 23, 2012 at Mineirinho Arena in Belo Horizonte, Brazil.

UFC 148: Silva vs. Sonnen II was a mixed martial arts event held by the Ultimate Fighting Championship on July 7, 2012 at the MGM Grand Garden Arena in Las Vegas, Nevada. It was the seventeenth UFC event of the year. The card consisted of eleven bouts, with six televised live on pay-per-view, four preliminary bouts on FX, and one on Facebook.

UFC 150: Henderson vs. Edgar II was a mixed martial arts event held by the Ultimate Fighting Championship on August 11, 2012, at the Ball Arena in Denver, Colorado.

UFC 151: Jones vs. Henderson was a planned mixed martial arts event that was to be held by the Ultimate Fighting Championship on September 1, 2012, at the Mandalay Bay Events Center in Las Vegas, Nevada. It was to be headlined by a UFC Light Heavyweight Championship bout, between champion Jon Jones and former dual-division PRIDE FC and Strikeforce champion Dan Henderson. However, the event was cancelled on August 23, when the UFC announced Henderson was unable to fight due to injury, and Jones refused to take a replacement fight against longtime middleweight contender, Chael Sonnen.

UFC 152: Jones vs. Belfort was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on September 22, 2012, at the Air Canada Centre in Toronto, Ontario, Canada.

UFC 153: Silva vs. Bonnar was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on October 13, 2012, at the HSBC Arena in Rio de Janeiro, Brazil.

UFC 154: St-Pierre vs. Condit was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on November 17, 2012, at the Bell Centre in Montreal, Quebec, Canada.

UFC 155: Dos Santos vs. Velasquez 2 was a mixed martial arts event held by the Ultimate Fighting Championship on December 29, 2012, at the MGM Grand Garden Arena in Las Vegas, Nevada.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

UFC on Fox: Diaz vs. Miller was a mixed martial arts event held by the Ultimate Fighting Championship on May 5, 2012 at the IZOD Center in East Rutherford, New Jersey.
UFC on Fox: Shogun vs. Vera was a mixed martial arts event held by the Ultimate Fighting Championship on August 4, 2012 at Staples Center in Los Angeles, California.

UFC on Fox: Henderson vs. Diaz is a mixed martial arts event that was held by the Ultimate Fighting Championship on December 8, 2012, at KeyArena in Seattle, Washington. It was broadcast live on Fox Sports.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

UFC on Fuel TV: Gustafsson vs. Silva was a mixed martial arts event held by the Ultimate Fighting Championship on April 14, 2012 at the Ericsson Globe Arena in Stockholm, Sweden.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

UFC on Fuel TV: Muñoz vs. Weidman was a mixed martial arts event held by the Ultimate Fighting Championship. The event took place on July 11, 2012 at the HP Pavilion in San Jose, California.
UFC on Fuel TV: Struve vs. Miocic was a mixed martial arts event held by the Ultimate Fighting Championship on September 29, 2012, at Capital FM Arena in Nottingham, United Kingdom.

UFC on Fuel TV: Franklin vs. Le was a mixed martial arts event held by the Ultimate Fighting Championship on November 10, 2012, at the Macau, SAR, China. It was the first UFC event held in China.

UFC on FX: Guillard vs. Miller was a mixed martial arts event held by the Ultimate Fighting Championship on January 20, 2012 at the Bridgestone Arena in Nashville, Tennessee.

UFC on FX: Alves vs. Kampmann was a mixed martial arts event held live by the Ultimate Fighting Championship on Saturday March 3, 2012 at the Allphones Arena in Sydney, Australia.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

The year 2012 was the 20th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States. 2012 started with UFC 142: Aldo vs. Mendes and ended with UFC 155: dos Santos vs. Velasquez 2. The year saw the successful UFC Featherweight title defense by José Aldo, the crowning of Carlos Condit as the Interim Welterweight Champion, a new Lightweight Champion in Benson Henderson, a tournament to crown the first UFC Flyweight Champion as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

UFC on FX: Maynard vs. Guida was a mixed martial arts event held by the Ultimate Fighting Championship on June 22, 2012 in Revel Casino in Atlantic City, New Jersey.

UFC on FX: Browne vs. Bigfoot was a mixed martial arts event held by the Ultimate Fighting Championship on October 5, 2012, at the Target Center in Minneapolis, Minnesota. It was the fifth UFC event broadcast live on FX.

World Series of Fighting 1: Arlovski vs. Cole was the inaugural event of the promotion held on November 3, 2012 at the Planet Hollywood Resort and Casino in Las Vegas, United States. The main card began at 10:30 p.m. Eastern Time and the preliminary card was streamed on Sherdog.com.