Macy Chiasson

Macy Chiasson (born July 27, 1991) is an American mixed martial artist. She was the Women's Featherweight winner of The Ultimate Fighter 28 and currently competes in the women's Bantamweight division of the Ultimate Fighting Championship (UFC). As of June 20, 2026, she is #13 in the Meta UFC women's bantamweight rankings.

Background Chiasson started mixed martial arts at the age of 19, after being bed-ridden for three and one-half weeks recovering from a car accident to get back the fitness level she once was when she was a softball player in high school. After attending some Krav Maga classes at the martial arts gym, she was attracted to the physical aggressiveness and the tough mental side of the combat sport and started teaching Krav Maga after one year of training. Chiasson transitioned to mixed martial arts, training under Mushin MMA and Mid City MMA, as Krav Maga is not a competition combat sport. She began competing in amateur MMA fights during college, amassing a record of 5-2. Chiasson graduated college with a degree in Biology, and began seriously considering competing professionally during her senior year.

Mixed martial arts career Early career Chiasson began her professional MMA career in 2017 and amassed a record of 2–0, fighting under Invicta Fighting Championships (Invicta) and Caged Warrior Championship. In 2018 Chiasson competed for a UFC contract on The Ultimate Fighter 28 UFC TV mma competition series.

Chiasson was the second pick of the featherweight fighters by coach Kelvin Gastelum. In the quarter-finals, she faced Larissa Pacheco. She won the fight via a technical knockout in round one. In the semi-finals, Chiasson faced Leah Letson She once again finished the bout by way of knockout in round one. This win secured Chiasson a spot in the finals against Pannie Kianzad.

Ultimate Fighting Championship Chiasson made her promotional debut on November 2, 2018, on The Ultimate Fighter 28 Finale. against Pannie Kianzad. She won the fight via a rear-naked choke submission in round two and winning the Ultimate Fighter women's featherweight tournament.

She made her Bantamweight debut on March 2, 2019, at UFC 235 against Gina Mazany. She won the fight via TKO in the first round.

On February 10, 2019, Chiasson replaced an injured Leah Letson and faced Sarah Moras on May 4, 2019, at UFC Fight Night: Iaquinta vs. Cowboy. Chiasson won the fight via technical knockout in the second round. This win earned her the Performance of the Night award.

Chiasson faced Lina Länsberg on September 28, 2019, at UFC on ESPN+ 18. She lost the fight via unanimous decision.

Chiasson was scheduled to face Nicco Montaño on February 15, 2020, at UFC Fight Night 167 However, Montaño was forced to pull from the event due to injury and she was replaced by Shanna Young. Chiasson won the fight by unanimous decision.

Chiasson was scheduled to face Sijara Eubanks on September 5, 2020, at UFC Fight Night 176. However, Chiasson pulled out of the fight for undisclosed medical reasons and was replaced by Karol Rosa.

The bout between Chiasson and Marion Reneau was originally scheduled for UFC Fight Night: Overeem vs. Volkov. However, during the week leading up to the fight, Reneau was pulled from the card after testing positive for COVID-19. The bout was rescheduled for UFC Fight Night: Rozenstruik vs. Gane. However, yet again, the bout was cancelled due to Reneau tested positive for COVID-19 and the bout eventually took place on March 20, 2021, at UFC on ESPN 21. Chiasson won the fight via unanimous decision.

Chiasson was scheduled to face Aspen Ladd on July 24, 2021, at UFC on ESPN: Sandhagen vs. Dillashaw. However, the bout was scrapped due to Chiasson suffering an injury. The bout was rescheduled to UFC Fight Night 193 on October 2, 2021. At the weigh-ins, Ladd weighed in at 137 pounds, one pound over the bantamweight non-title limit; due to health concerns resulting from Ladd's weight cut, the bout was cancelled.

Chiasson replaced Julia Avila to face Raquel Pennington on December 18, 2021, at UFC Fight Night 199. At the weigh-ins, Chiasson weighed in at 148.5 pounds, 3.5 pounds over the women's featherweight non-title fight limit. The bout proceeded at a catchweight with Chiasson fined a percentage of her purse, which went to Pennington. She lost the fight via guillotine submission in the second round.

Chiasson faced Norma Dumont on May 7, 2022, at UFC 274. At the weigh-ins, Dumont weighed in at 146.5 pounds, half a pound over the women's featherweight non-title fight limit. The bout proceeded at catchweight, with Dumont forfeiting 30% of her purse to Chiasson. Chiasson won the fight via split decision.

Returning to bantamweight, Chiasson faced Irene Aldana on September 10, 2022, at UFC 279. She lost the fight via knockout via an upkick to the body in the third round.

Chiasson was scheduled to face Ketlen Vieira on January 13, 2024, at UFC Fight Night 234. However, Vieira was pulled due to an injury and the bout was scrapped.

Chiasson faced Pannie Kianzad in a rematch on March 16, 2024, at UFC Fight Night 239. She won by a rear-naked choke submission in the first round. This fight earned her another Performance of the Night award.

Chiasson faced Mayra Bueno Silva on June 29, 2024, at UFC 303. She won the fight by technical knockout via doctor stoppage after landing an elbow which opened a cut above Silva's eye. This fight earned her another Performance of the Night award.

Chiasson was re-scheduled to face Ketlen Vieira on February 22, 2025 at UFC Fight Night 252. However, due to an injury suffered by Chiasson, the bout was removed from the card. The bout between Viera and Chiasson was re-booked for May 31, 2025 at UFC on ESPN 68. The bout was originally scheduled to be a women's bantamweight bout but on the day of the weigh-ins, it was announced that the bout would be changed to a featherweight bout due to "weight management issues" from Vieira, who in turn forfeited 25% of her purse. Chiasson lost the fight by unanimous decision.

Chiasson faced Yana Santos on October 4, 2025, at UFC 320. At the weigh-ins, Chiasson weighed in at 137.5 pounds, one and a half pounds over the women's bantamweight non-title fight limit. The bout proceeded at catchweight and Chiasson was fined a percentage of her purse, which went to Santos. Chiasson lost the fight by unanimous decision.

Chiasson faced Ailín Pérez on February 28, 2026, at UFC Fight Night 268. She lost the fight by unanimous decision.

Personal life Chiasson is an open lesbian and is married to flute professor Dr. Hannah (Leffler) Chiasson.

In April 2010, Chiasson and a friend were victims of a random drive-by shooting in Houma, which left Chiasson shot in the stomach and her friend shot in the leg. While neither injury was particularly life-threatening, the incident left Chiasson bedridden as she recovered. She has credited the experience as a major reason she initially joined a self-defense gym.

In June 2019, Chiasson's Dallas home was severely damaged when a crane fell on her apartment complex, blown over by heavy storm winds. Chiasson was forced to quickly evacuate, with only enough time to escape with her pet dog. The accident left the complex partially destroyed and killed one woman while injuring multiple others. Shortly after, Chiasson sued the relevant crane company and apartment owner for gross negligence.

Championships and accomplishments

Mixed martial arts Ultimate Fighting Championship Performance of the Night (Three times)

Mixed martial arts record Loss

Ailín Pérez Decision (unanimous) UFC Fight Night: Moreno vs. Kavanagh

Mexico City, Mexico Loss

Yana Santos Decision (unanimous) UFC 320

Las Vegas, Nevada, United States Loss

Ketlen Vieira Decision (unanimous) UFC on ESPN: Gamrot vs. Klein

Las Vegas, Nevada, United States Win

Mayra Bueno Silva TKO (doctor stoppage) UFC 303

Las Vegas, Nevada, United States Win

Pannie Kianzad Submission (rear-naked choke) UFC Fight Night: Tuivasa vs. Tybura

Las Vegas, Nevada, United States Loss

Irene Aldana KO (upkick to the body) UFC 279

Las Vegas, Nevada, United States Win

Norma Dumont Decision (split) UFC 274

Phoenix, Arizona, United States Loss

Raquel Pennington Submission (guillotine choke) UFC Fight Night: Lewis vs. Daukaus

Las Vegas, Nevada, United States Win

Marion Reneau Decision (unanimous) UFC on ESPN: Brunson vs. Holland

Las Vegas, Nevada, United States Win

Shanna Young Decision (unanimous) UFC Fight Night: Anderson vs. Błachowicz 2

Rio Rancho, New Mexico, United States Loss

Lina Länsberg Decision (unanimous) UFC Fight Night: Hermansson vs. Cannonier

Copenhagen, Denmark Win

Sarah Moras TKO (punches) UFC Fight Night: Iaquinta vs. Cowboy

Ottawa, Ontario, Canada Win

Gina Mazany TKO (punches) UFC 235

Las Vegas, Nevada, United States Win

Pannie Kianzad Submission (rear-naked choke) The Ultimate Fighter: Heavy Hitters Finale

Las Vegas, Nevada, United States Win

Allison Schmidt Decision (unanimous) Invicta FC 29

Kansas City, Missouri, United States Win

Miranda Dearing Submission (armbar) Caged Warrior Championship 16

Houma, Louisiana, United States

Mixed martial arts exhibition record Win

Leah Letson KO (knees to the body)

(airdate)

Win

Larissa Pacheco TKO (punches) (airdate)