Guilherme Viana

Guilherme Viana (born May 13, 1986) is a Brazilian mixed martial artist formerly competing in Bellator's Light Heavyweight division. A professional competitor since 2012, Viana was a contestant on The Ultimate Fighter: Brazil 3. He currently competes as a bare-knuckle boxer in Bare Knuckle Fighting Championship.

Mixed martial arts career

Early career Viana began his professional MMA career in March 2012. He quickly compiled a 4–1 record, with his lone loss being against former UFC and Bellator competitor Rodney Wallace, before appearing on The Ultimate Fighter: Brazil 3.

The Ultimate Fighter: Brazil 3 In February 2014, Viana was revealed as one of the contestants on The Ultimate Fighter: Brazil 3, competing as a heavyweight. In the fight to get into the house, Viana lost to eventual winner of the heavyweight tournament Antônio Carlos Júnior via TKO in the first round, thus being eliminated from the competition.

Bellator MMA Viana made his Bellator and United States debut against nine-time UFC veteran Francis Carmont at Bellator 135 on March 27, 2015. Viana lost the fight via unanimous decision.

Viana faced another UFC veteran in Houston Alexander at Bellator 146 on November 20, 2015. He won the fight via TKO due to a doctor stoppage following the conclusion of the second round.

Viana then faced Philipe Lins at Bellator 159 on July 22, 2016. After a conservative first round from both fighters, Viana lost the fight via TKO due to punches in the second.

Bare-knuckle boxing career Viana made his Bare Knuckle Fighting Championship debut against Aleem Whitfield on December 20, 2025 at BKFC Fight Night 33. He won by knockout at the end of the second round.

Viana faced Juan Figuerva on January 17, 2026 at BKFC 86. He won the fight by knockout at the end of the first round.

Viana faced Joseph White on March 28, 2026 at BKFC Fight Night 35. He lost the fight by knockout in the first round.

Viana faced Robinson Perez on August 29, 2026 at BKFC 92. He won the fight by technical knockout in the first round. This fight earned him a Knockout of the Night award.

Personal life Viana has a brother, who is also a mixed martial artist.

Championships and accomplishments Bare-knuckle boxing Bare Knuckle Fighting Championship Knockout of the Night (One time)

Mixed martial arts record Loss

Rasul Magomedov Decision (unanimous) PFL 10 (2025)

Hollywood, Florida, United States Win

Hassan Graham KO (punches) Combat Zone 86

Manchester, New Hampshire, United States Win

Terrance Jean-Nacques TKO (punches) Combat Zone 83

Manchester, New Hampshire, United States Loss

Philipe Lins TKO (punches) Bellator 159

Mulvane, Kansas, United States Win

Houston Alexander TKO (doctor stoppage) Bellator 146

Thackerville, Oklahoma, United States Loss

Francis Carmont Decision (unanimous) Bellator 135

Thackerville, Oklahoma, United States Win

Julio Cesar dos Santos TKO (punches) The Hill Fighters 2

Gramado, Brazil Win

Cristiano Monteiro Submission (rear-naked choke) Shooto Brazil 47

Rio Bonito, Brazil Win

Ricardo Silva TKO (punches) Watch Out Combat Show 28

Gramado, Brazil Loss

Rodney Wallace Decision (split) Iron Fight Combat 2

Aracaju, Brazil Win

Ed Carlos TKO (punch) Iron Fight Combat 1

Feira de Santana, Brazil Win

Gustavo Gussem TKO (punches) Watch Out Combat Show 19

Rio de Janeiro, Brazil Win

Eduardo Camilo Submission (armbar) MMA Against Dengue 2

São Gonçalo, Brazil Bare-knuckle boxing record Win

Robinson Perez TKO (punches) BKFC 92

Boston, Massachusetts, United States Loss

Joseph White TKO BKFC Fight Night Mohegan Sun: Porter vs. Wilson

Uncasville, Connecticut, United States Win

Juan Figuerva KO BKFC 86

Uncasville, Connecticut, United States Win

Aleem Whitfield KO BKFC Fight Night Mohegan Sun: Porter vs. Garrett

Uncasville, Connecticut, United States