Mateusz Legierski (born July 23, 1996) is a Polish professional mixed martial artist. He currently competes in the Lightweight division of Oktagon MMA, where he is the current, two-time, and inaugural Lightweight Champion.
Legierski made his professional debut on September 22, 2018 against Kamil Czyà ¼ewski. Legierski won the fight via a second-round TKO.
His next fight came a month later on October 27 against Konrad Furmanek. Legierski won the fight via a first-round submission.
Legierski made his debut under Czech-based federation Oktagon MMA against Michal Konrád on March 16, 2019. Legierski won the fight via a first-round TKO.
His next fight came on June 8, 2019 against Ronald Paradeiser. Legierski won the fight via a second-round TKO.
His next fight came on November 9, 2019 against Jakub BahnÃÂk. Legierski won via a first-round knockout.
Legierski faced Miroslav à  trbák for the inaugural Oktagon lightweight championship on February 15, 2020. Legierski won the fight via a split decision, becoming the inaugural champion, and winning his first career championship in the process.
Legierski returned to his native Poland after signing with Konfrontacja Sztuk Walki (KSW) on May 25, 2020, while vacating his Oktagon lightweight championship in the process.
Legierski was scheduled to face Roman Szymaà Âski in his promotional debut. The bout was later cancelled after Legierski withdrew due to injury, and was replaced with Filip PejiÃÂ.
His debut came on November 14, 2020 against Francisco Barrio. Legierski won the fight via a Majority Decision.
His final fight with the federation came on December 18, 2021 against Roman Szymaà Âski. Legierski lost the fight via a second-round TKO.
Legierski returned to Oktagon MMA on July 23, 2022 against Matouà ¡ Kohout. Legierski won the fight via a third-round submission.
His next fight came on May 20, 2023 against MatÃÂj KuznÃÂk. Legierski won the fight via a Unanimous Decision.
His next fight came on October 7, 2023 against Karol Ryà ¡avý. Legierski won the fight via a Unanimous Decision.
His next fight came on March 2, 2024 in a rematch against Matouà ¡ Kohout in the opening round of the Oktagon Lightweight Tournament. Legierski won the fight via a first-round submission.
In the quarterfinals, he faced Akonne Wanliss on June 8, 2024. Legierski won the fight via a Unanimous Decision.
In the semifinals, he faced Losene Keita on September 21, 2024. Legierski lost the fight via a Unanimous Deicision.
Following a fourteen-month hiatus, Legierski returned on November 22, 2025 where he faced Attila Korkmaz for the vacant Oktagon lightweight championship. Legierski won the fight via a Unanimous Decision, winning the championship for the second time in his career.
|- |Win |align=center|13âÂÂ2 |Attila Korkmaz |Decision (unanimous) | | |align=center|5 |align=center|5:00 |Munich, Germany | |- |Loss |align=center|12âÂÂ2 |Losene Keita |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Brno, Czech Republic | |- |Win |align=center|12âÂÂ1 |Akonne Wanliss |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Prague, Czech Republic | |- |Win |align=center|11âÂÂ1 |Matouà ¡ Kohout |Submission (rear-naked choke) | | |align=center|1 |align=center|4:38 |Ostrava, Czech Republic | |- |Win |align=center|10âÂÂ1 |Karol Ryà ¡avý |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Bratislava, Slovakia | |- |Win |align=center|9âÂÂ1 |MatÃÂj KuznÃÂk |Decision (unanimous) | | |align=center|3 |align=center|5:00 |Prague, Czech Republic | |- |Win |align=center|8âÂÂ1 |Matouà ¡ Kohout |Submission (rear-naked choke) |Oktagon 34 | |align=center|3 |align=center|2:56 |Prague, Czech Republic | |- |Loss |align=center|7âÂÂ1 |Roman Szymaà Âski |TKO (punches) | | |align=center|2 |align=center|4:47 |Gliwice, Poland | |- |Win |align=center|7âÂÂ0 |Francisco Barrio |Decision (majority) | | |align=center|3 |align=center|5:00 |à Âódà º, Poland | |- |Win |align=center|6âÂÂ0 |Miroslav à  trbák |Decision (split) |Oktagon Prime 3 | |align=center|5 |align=center|5:00 |à  amorÃÂn, Slovakia | |- |Win |align=center|5âÂÂ0 |Jakub BahnÃÂk |KO (punch) |Oktagon 15 | |align=center|1 |align=center|1:46 |Prague, Czech Republic | |- |Win |align=center|4âÂÂ0 |Ronald Paradeiser |TKO (punches) |Oktagon 12 | |align=center|2 |align=center|1:41 |Bratislava, Slovakia | |- |Win |align=center|3âÂÂ0 |Michal Konrád |TKO (punches) |Oktagon 11 | |align=center|1 |align=center|4:47 |Ostrava, Czech Republic | |- |Win |align=center|2âÂÂ0 |Konrad Furmanek |Submission (triangle choke) |Gala Sportów Walki 9 | |align=center|1 |align=center|2:03 |MiÃÂdzychód, Poland | |- |Win |align=center|1âÂÂ0 |Kamil Czyà ¼ewski |TKO (punches) |PLMMA 76 | |align=center|2 |align=center|2:29 |Biaà Âystok, Poland |
|- bgcolor="#cfc" | 2018-06-16 || Win ||align=left| Adam Piastowski || Silesian MMA 1 || Mysà Âowice, Poland || KO (Flying Knee) ||1 ||0:20