Guilherme Viana (9-4, 9) was born in Porto Alegre, Rio Grande do Sul, Brazil on May 13, 1986. At the age of 25 years on March 4, 2012, he made his professional MMA debut against Eduardo Camilo, winning the fight via 1st-round submission.
Viana's last fight was a 3-round unanimous decision loss to Rasul Magomedov at PFL 10 at age 39 on August 21, 2025. He is on a 1-fight losing streak.
Some of Guilherme Viana's best fights have been against Houston Alexander.
Viana has 4 losses on his MMA record.
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
13 | Aug 21, 2025 39 years, 3 months 9-4 (9) | Rasul Magomedov | PFL | LHW | 3 | UD | LOSS |
12 | Nov 9, 2024 38 years, 5 months 9-3 (9) | Hassan Graham | HW | 1 | KO | WIN Punches | |
11 | Feb 24, 2024 37 years, 9 months 8-3 (8) | Terrance Jean-Nacques | LHW | 2 | TKO | WIN Punches | |
10 | Jul 22, 2016 30 years, 2 months 7-3 (7) | Philipe Lins | Bellator | LHW | 2 | TKO | LOSS Punches |
9  | Nov 20, 2015 29 years, 6 months 7-2 (7) | 43 years, 7 months 16-12-1 (14) | Bellator | LHW | 2 | TKO | WIN Doctor stoppage |
8  | Mar 27, 2015 28 years, 10 months 6-2 (6) | 33 years, 5 months 22-10 (16) | Bellator | LHW | 3 | UD | LOSS |
7 | Jul 12, 2014 28 years, 1 months 6-1 (6) | Julio Cesar dos Santos | LHW | 2 | TKO | WIN Punches | |
6 | Apr 4, 2014 27 years, 10 months 5-1 (5) | Cristiano Monteiro | LHW | 1 | SUB | WIN Rear-naked choke | |
5 | Aug 10, 2013 27 years, 2 months 4-1 (4) | Ricardo Silva | LHW | 1 | TKO | WIN Punches | |
4  | Dec 7, 2012 26 years, 6 months 3-1 (3) | 31 years 14-6 (5) | LHW | 3 | SD | LOSS | |
3 | Sep 1, 2012 26 years, 3 months 3-0 (3) | Ed Carlos | LHW | 1 | TKO | WIN Punch | |
2 | May 18, 2012 26 years 2-0 (2) | Gustavo Gussem | LHW | 1 | TKO | WIN Punches | |
1 | Mar 4, 2012 25 years, 9 months 1-0 (1) | Eduardo Camilo | LHW | 1 | SUB | WIN Armbar |
