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Olivier Aubin-Mercier

Olivier Aubin-Mercier is a Canadian retired mixed martial artist known for competing at lightweight.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Olivier Aubin-Mercier is a Canadian retired mixed martial artist known for competing at lightweight. He fought in the UFC, under the leadership of Dana White, and later in the Professional Fighters League (PFL), where he became a two-time PFL Lightweight Champion. He retired in 2023 after a 21–5 professional record.

Early life and background

Olivier Aubin-Mercier was born in Montreal, Quebec, Canada. He is a Canadian fighter who competed in mixed martial arts after a background in judo. Canada has produced several notable MMA champions, including Georges St-Pierre.

Mixed martial arts career

Aubin-Mercier turned professional in 2011 and fought in the UFC from 2014 to 2019 before moving to the PFL in 2020. His professional record is listed as 21–5–0. He competed in the lightweight division, which has featured fighters such as Justin Gaethje and Dustin Poirier. The UFC has also featured champions like Max Holloway and Ilia Topuria.

Professional Fighters League success

In the PFL, Aubin-Mercier won the lightweight championship in 2022 and again in 2023. The PFL also identifies him as the promotion's first Canadian champion.

Retirement

After winning his second PFL lightweight title in 2023, Aubin-Mercier announced his retirement from MMA. Coverage at the time described him as retiring after a decade-long pro career.

Key facts

  • Born on February 23, 1989, in Montreal, Quebec, Canada.
  • Competed professionally in MMA from 2011 to 2023.
  • Fought in the UFC from 2014 to 2019 before joining the PFL.
  • Won the PFL Lightweight Championship in 2022 and 2023.
  • Retired from MMA after winning back-to-back PFL titles.
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Canadian context

Aubin-Mercier is a Canadian fighter from Montreal, Quebec, and is noted as the PFL’s first Canadian champion.

Frequently asked questions

Who is Olivier Aubin-Mercier?
He is a Canadian retired mixed martial artist who competed at lightweight in the UFC and PFL.
How old is Olivier Aubin-Mercier?
He was born on February 23, 1989, so he is 37 years old in 2026.
What is Olivier Aubin-Mercier's record?
His professional MMA record is 21–5–0.
What organization does Olivier Aubin-Mercier fight for?
He most recently fought for the Professional Fighters League (PFL) before retiring in 2023.
Where is Olivier Aubin-Mercier from?
He is from Montreal, Quebec, Canada.
Did Olivier Aubin-Mercier win a title?
Yes. He won the PFL Lightweight Championship in 2022 and 2023.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Olivier_Aubin-Mercier
    Supports: Birth date, Canadian nationality, UFC and PFL career, retirement, and championship wins.
  2. Professional Fighters League — https://www.pflmma.com/wt-fighter/olivier-aubin-mercier
    Supports: Career record, birthplace, fighting location, and PFL titles.
  3. ESPN — https://www.espn.com/mma/fighter/_/id/3096577/olivier-aubin-mercier
    Supports: Birth date, nationality, weight class, and team.
  4. Sportsnet — https://www.sportsnet.ca/mma/article/olivier-aubin-mercier-retires-days-after-winning-pfl-title/
    Supports: Retirement and confirmation of PFL title wins.