Jack Berndhard Hermansson (born 10 June 1988) is a Swedish and Norwegian professional mixed martial artist.

[6][3] Hermansson turned professional in 2010 and racked up a 5–0 record, all stoppages (4 KO's, 1 submission), in a little over a year.

[15] Less than a month later Hermansson took on Ion Pascu on 18 April 2014, at Cage Warriors: Fight Night 11.

[17] Hermansson challenged for the promotional title against veteran and fellow former Bellator fighter Norman Paraisy on 7 June 2014, at Cage Warriors 69.

[18] He became the champion after he defeated Paraisy by submission due to a rear-naked choke at the end of round 4.

[26] Hermansson was scheduled to face Kévin Del on 29 November 2015, at Lion FC 6 for the promotional championship.

[27] Next Hermansson instead fought undefeated polish fighter Maciej Rozanski on 12 December 2015, at Venator FC 2.

[29] Hermansson was supposed to defend his WFS title on 13 February 2016, at Warrior Fight Series 5.

[31][32] Hermansson defended his CWFC title against Alan Carlos on the first event after the promotion's return on 15 April 2016, at Cage Warriors 75.

He made his promotional debut against Scott Askham on 3 September 2016, at UFC Fight Night 93.

[55] Hermansson had a quick turnaround as he replaced an injured Yoel Romero to face former Strikeforce middleweight champion Ronaldo Souza on 27 April 2019, in the main event at UFC Fight Night 150.

[58] Hermansson faced Jared Cannonier on 28 September 2019, in the main event of UFC Fight Night 160.

[61] However, on 9 April, Dana White, the president of UFC announced that the event was cancelled due to the COVID-19 pandemic.

[71] However, due to Hermansson contracting COVID-19 the bout was postponed and took place at UFC Fight Night: Font vs. Garbrandt on 22 May 2021.

[75] Hermansson was scheduled to face Darren Till on 23 July 2022, at UFC Fight Night 208.

[76] Till was forced to pull out from the match due to an undisclosed injury and Hermansson instead faced Chris Curtis.

[85] On 5 March 2016, Hermansson competed in a superfight at Oslo Submission Series 2 against Norwegian black belt Christopher Hermanstad.

[86] Hermansson competed against fellow UFC contender Khamzat Chimaev in a freestyle wrestling match on 19 November 2021, at Sweden-based Bulldog Fight Night 9, losing 8–0 on points.

[87] Hermansson was raised in Uddevalla, Sweden with his six siblings before moving to Norway when he was 19 years old to find work.

[88][89] Before focusing full-time on his fighting career he had various jobs, including working in a pet store, being a bartender and as a substitute teacher.