Ľudovít Klein (born February 22, 1995) is a Slovak mixed martial artist who competes in the Lightweight division of the Ultimate Fighting Championship.

He later added Thai boxing to his martial arts training, which is how he first heard about the amateur MMA league.

On the domestic scene, Lajoš went undefeated in his first six fights in smaller Slovak organizations, after which he decided to go abroad.

In both, he won the bouts comfortably, but decided to return to the Oktagon due to problems in the organization.

[10] Klein faced Nate Landwehr on October 16, 2021 at UFC Fight Night: Ladd vs.

[12] Klein faced Devonte Smith, replacing injured Erick Gonzalez, on March 5, 2022, at UFC 272.

[15] However, Bahamondes pulled out on July 15, 2022 and Klein was rebooked against Mason Jones a week earlier at UFC Fight Night: Blaydes vs.

[21] Klein was rescheduled to face Ignacio Bahamondes on August 5, 2023 at UFC Fight Night 226.

[23] Klein was scheduled to face Joel Álvarez on March 2, 2024, at UFC Fight Night 238.

[25] Klein won by technical knockout as a result of a body kick and follow-up punches at the end of the first round.

[28] Klein was scheduled to face Nikolas Motta on September 28, 2024 at UFC Fight Night 243.