Kamil Oniszczuk

Kamil Oniszczuk (born 28 September 1996) is a Polish professional mixed martial artist. He currently competes in the Middleweight division of Oktagon MMA. He has previously competed under Fight Nation Championship (FNC), Bellator MMA, Absolute Championship Akhmat (ACA) and Babilon MMA.

Professional career Early career Oniszczuk made his professional debut on March 12, 2016, against Bartosz Siwek. Oniszczuk won the fight via a Unanimous Decision.

His next fight came on October 15, 2016, against Dominik Szalczyk. Oniszczuk won the fight via a third-round TKO.

His next fight came on June 24, 2017, against Paweł Szaja. Oniszczuk won the fight via a Unanimous Decision.

Babilon MMA Oniszczuk made his debut under Babilon MMA on December 2, 2017. His original opponent was scheduled to be Paweł Celiński, however, he pulled out due to an injury, with his replacement being Paweł Karwowski. Oniszczuk won the fight via a Unanimous Decision.

His next fight came on March 16, 2018, against Maksim Potapov. Oniszczuk won the fight via a submission just under a minute of the first round.

His next fight came on August 18, 2018, against Said-Magomed Abdulkadyrov. Oniszczuk won the fight via a Unanimous Decision.

His next fight came on January 25, 2019, against Guilherme Cadena. Oniszczuk won the fight via a TKO, after his opponent retired on the stool following the first round.

Absolute Championship Akhmat Oniszczuk made his debut under Russian federation Absolute Championship Akhmat (ACA) on August 20, 2020, against Mindaugas Veržbickas. Oniszczuk lost the fight via a Unanimous Decision, suffering his first career defeat in the process.

His next fight came on November 26, 2020, against Krystian Bielski. Oniszczuk won the fight via a third-round knockout. This performance earned him his first career Knockout of the Night bonus.

His final fight with the federation came on December 4, 2021, against Vladimir Fedin. Oniszczuk won the fight via a first-round TKO.

Bellator MMA On March 29, 2022, it was announced that Oniszczuk had signed with American federation Bellator MMA.

His debut came on October 29, 2022, against Costello van Steenis on the undercard of Bellator 287. Oniszczuk lost the fight via a second-round submission.

His final fight with the federation came on June 16, 2023, against Norbert Növényi Jr.. on the undercard of Bellator 297. Oniszczuk lost the fight via a first-round knockout.

CaveMMA Oniszczuk returned to his native Poland, where he faced Carlo Prater on March 1, 2024, under the federation CaveMMA. Oniszczuk won the fight via a TKO less than a minute into the first round.

Fight Nation Championship Oniszczuk made his debut under Croatian federation Fight Nation Championship (FNC) on November 23, 2024, against Andi Vrtačić. Oniszczuk lost the fight via a third-round TKO.

Oktagon MMA Oniszczuk made his debut under Oktagon MMA on February 1, 2025. His debut was originally scheduled to be against Hojat Khajevand in a reserve bout for the Oktagon Middleweight Tournament. However, he was then moved to face Kerim Engizek in the main event of the event with the bout being in the opening round of the aforementioned tournament. The change was made after Engizek's original opponent, Anthony Salamone was forced to withdraw after failing doping tests, and being suspended by the French Anti-Doping Agency. Oniszczuk lost the fight via a Unanimous Decision.

His next fight came on August 9, 2025, against David Zawada. Oniszczuk won the fight via a Unanimous Decision.

His next fight came on January 17, 2026, against Marek Bartl. Oniszczuk won the fight via a second-round submission.

His next fight came on July 11, 2026, against Mick Stanton. Oniszczuk won the fight via a Unanimous Decision.

Championships and accomplishments Mixed martial arts Absolute Championship Akhmat Knockout of the Night (One time)

Mixed martial arts record Win

Mick Stanton Decision (unanimous) Oktagon 91

Cologne, Germany Win

Marek Bartl Technical Submission (arm-triangle choke) Oktagon 82

Düsseldorf, Germany Win

David Zawada Decision (unanimous) Oktagon 74

Prague, Czech Republic Loss

Kerim Engizek Decision (unanimous) Oktagon 66

Düsseldorf, Germany Loss

Andi Vrtačić TKO (punches) FNC 20

Zagreb, Croatia Win

Carlo Prater TKO (leg kick) CAVEMMA 4

Jastrzębie-Zdrój, Poland Loss

Norbert Növényi Jr. KO (punches) Bellator 297

Chicago, Illinois, United States Loss

Costello van Steenis Submission (brabo choke) Bellator 287

Milan, Italy Win

Vladimir Fedin TKO (body kick and punches) ACA 133

Saint Petersburg, Russia Win

Krystian Bielski KO (head kick) ACA 114

Łódź, Poland Loss

Mindaugas Veržbickas Decision (unanimous) ACA 109

Łódź, Poland Win

Guilherme Cadena TKO (shoulder injury) Babilon MMA 7

Żyrardów, Poland Win

Said-Magomed Abdulkadyrov Decision (unanimous) Babilon MMA 5

Międzyzdroje, Poland Win

Maksim Potapov Submission (arm-triangle choke) Babilon MMA 3

Radom, Poland Win

Paweł Karwowski Decision (unanimous) Babilon MMA 2

Legionowo, Poland Win

Paweł Szaja Decision (unanimous) MMA Way 1

Żary, Poland Win

Dominik Szalczyk TKO (punches) Gala Sportów Walki 7

Międzychód, Poland Win

Bartosz Siwek Decision (unanimous) Soul FC 4

Zielona Góra, Poland