Sergei Vladimirovich Pavlovich (Russian: Сергей Владимирович Павлович; born 13 May 1992) is a Russian professional mixed martial artist. Pavlovich currently competes in the Heavyweight division of the Ultimate Fighting Championship (UFC). A one-time champion of Russia in Combat Kung Fu. He was also the former Fight Nights Global heavyweight champion. As of June 20, 2026, he is #3 in the Meta UFC heavyweight rankings.

Sergei was born in 1992 in the village of Orlovsky, Rostov Oblast. At the age of five Pavlovich began to engage in Greco-Roman wrestling under the guidance of coach Alexander Fedorovich Aloyan. He trained specifically in wrestling until the 12th grade. After serving in the army, he began to train in Combat Sambo where he won most of his competitions.

He was invited to train for the Russian Olympic team but declined because of Sambo tournaments that he had at the time. He is believed to be the active UFC fighter with the largest ape index of 1.115.

Pavlovich started his professional MMA career in 2014 under the Fight Nights Global promotion, under which he won 12 fights without suffering a single defeat. On June 2, 2017, in a fight against Mikhail Mokhnatkin, he won the heavyweight title by unanimous decision. On November 19, 2017, he defended his heavyweight title in a fight against Kirill Sidelnikov.

Pavlovich made his UFC debut on November 24, 2018 at UFC Fight Night 141 against Alistair Overeem. He lost the fight via TKO in the first round.

Pavlovich faced Marcelo Golm on April 20, 2019, at UFC Fight Night: Overeem vs. Oleinik. He won the fight via knockout. This win earned Performance of the Night award.

Pavlovich faced Maurice Greene on October 26, 2019, at UFC Fight Night 162. He won the fight via knockout in the first round.

Pavlovich was expected to face Ciryl Gane on August 8, 2020, at UFC Fight Night 174. Pavlovich however had to pull out because of an injury.