Länsberg made her UFC debut, as a big underdog, in the main event against Cris Cyborg on 24 September 2016 at UFC Fight Night 95.
She lost the fight by TKO in the second round.

She was first expected to face Veronica Macedo on 18 March 2017 at UFC Fight Night 107.
However, Macedo later had to pull out due to injury.
Länsberg instead had a rematch with Lucie Pudilová at the same event.
It was a back-and-forth fight, with Länsberg appearing to be in control over the first two rounds and Pudilová rallying for a comeback in the third, in the end Länsberg won by unanimous decision.
Afterwards, she expressed disappointment with her performance, saying she believed that Pudilová maybe should have been awarded the victory.
Despite this, a majority of the media score cards still agreed with the judges and had Länsberg as the winner.

Länsberg was expected to face Leslie Smith on 16 July 2017 at UFC Fight Night 113.
However, she later had to withdraw from the fight due to an injury and was replaced by Amanda Lemos.
Länsberg revealed that she had tore up some old injuries in training camp.

She faced Aspen Ladd on 22 October 2017 at UFC Fight Night 118.
She lost the fight via TKO in round two.

Länsberg faced Gina Mazany on 27 May 2018 at UFC Fight Night 130.
She won the fight via unanimous decision.

Next she faced former Invicta FC Bantamweight Champion Yana Kunitskaya on 6 October 2018 at UFC 229.
She lost the fight via unanimous decision 
Länsberg faced former long time Invicta FC Bantamweight Champion Tonya Evinger on 1 June 2019 at UFC Fight Night 153.
Despite entering the contest as a big underdog, she won the fight via unanimous decision.

In her next fight, Länsberg faced Macy Chiasson on 28 September 2019 at UFC Fight Night 160.
She won the fight by unanimous decision.

Länsberg faced Sara McMann on 25 January 2020 at UFC Fight Night 166.
She lost the fight via unanimous decision.
Länsberg made her UFC debut, as a big underdog, in the main event against Cris Cyborg on 24 September 2016 at UFC Fight Night 95. She lost the fight by TKO in the second round.
She was first expected to face Veronica Macedo on 18 March 2017 at UFC Fight Night 107. However, Macedo later had to pull out due to injury. Länsberg instead had a rematch with Lucie Pudilová at the same event. It was a back-and-forth fight, with Länsberg appearing to be in control over the first two rounds and Pudilová rallying for a comeback in the third, in the end Länsberg won by unanimous decision. Afterwards, she expressed disappointment with her performance, saying she believed that Pudilová maybe should have been awarded the victory. Despite this, a majority of the media score cards still agreed with the judges and had Länsberg as the winner.
Länsberg was expected to face Leslie Smith on 16 July 2017 at UFC Fight Night 113. However, she later had to withdraw from the fight due to an injury and was replaced by Amanda Lemos. Länsberg revealed that she had tore up some old injuries in training camp.
She faced Aspen Ladd on 22 October 2017 at UFC Fight Night 118. She lost the fight via TKO in round two.
Länsberg faced Gina Mazany on 27 May 2018 at UFC Fight Night 130. She won the fight via unanimous decision.
Next she faced former Invicta FC Bantamweight Champion Yana Kunitskaya on 6 October 2018 at UFC 229. She lost the fight via unanimous decision 
Länsberg faced former long time Invicta FC Bantamweight Champion Tonya Evinger on 1 June 2019 at UFC Fight Night 153. Despite entering the contest as a big underdog, she won the fight via unanimous decision.
In her next fight, Länsberg faced Macy Chiasson on 28 September 2019 at UFC Fight Night 160. She won the fight by unanimous decision.
Länsberg faced Sara McMann on 25 January 2020 at UFC Fight Night 166. She lost the fight via unanimous decision.
Lina Länsberg