| Result | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Win | 18-1 | Manvel Gamburyan | KO (Punches) | WEC 51: Aldo vs. Gamburyan | September 30, 2010 | 2 | 1:32 | Broomfield, Colorado, US | Defended WEC Featherweight Championship, Awarded UFC Featherweight Championship after UFC-WEC merger. |
| Win | 17-1 | Urijah Faber | Decision (Unanimous) | WEC 48: Aldo vs. Faber | April 24, 2010 | 5 | 5:00 | Sacramento, California, US | Defended WEC Featherweight Championship |
| Win | 16-1 | Mike Brown | TKO (Punches) | WEC 44: Brown vs. Aldo | November 18, 2009 | 2 | 1:20 | Las Vegas, Nevada, US | Won WEC Featherweight Championship, Knockout of the Night. |
| Win | 15-1 | Cub Swanson | TKO (Double Flying Knee & Punches) | WEC 41: Brown vs. Faber II | June 7, 2009 | 1 | 0:08 | Sacramento, California, US | Knockout of the Night |
| Win | 14-1 | Chris Mickle | TKO (Strikes) | WEC 39: Brown vs. Garcia | March 1, 2009 | 1 | 1:39 | Corpus Christi, Texas, US | |
| Win | 13-1 | Rolando Perez | KO (Knee and Punches) | WEC 38: Varner vs. Cerrone | January 25, 2009 | 1 | 4:15 | San Diego, California, US | Knockout of the Night |
| Win | 12-1 | Jonathan Brookins | TKO (Punches) | WEC 36: Faber vs. Brown | November 5, 2008 | 3 | 0:45 | Hollywood, Florida, US | |
| Win | 11-1 | Alexandre Nogueira | TKO (Elbows) | WEC 34: Faber vs. Pulver | June 1, 2008 | 2 | 3:22 | Sacramento, California, US | WEC debut |
| Win | 10-1 | Shoji Maruyama | Decision (Unanimous) | Pancrase: 2007 Neo-Blood Tournament Finals | July 27, 2007 | 3 | 5:00 | Tokyo, Japan | |
| Win | 9-1 | Fabio Mello | Decision (Unanimous) | TopFC 3 | May 2, 2007 | 3 | 5:00 | Rio de Janeiro, Brazil | |
| Win | 8-1 | Thiago Minu | Decision (Majority) | GoldFC 1 | May 20, 2006 | 3 | 5:00 | Rio de Janeiro, Brazil | |
| Loss | 7-1 | Luciano Azevedo | Submission (Rear Naked Choke) | Jungle Fight 5 | November 26, 2005 | 2 | 3:37 | Manaus, Brazil | |
| Win | 7-0 | Micky Young | TKO (Punches) | FX3: Battle of Britain | October 15, 2005 | 1 | 1:05 | Reading, England | |
| Win | 6-0 | Phil Harris | TKO (Doctor Stoppage) | UK-1: Fight Night | September 17, 2005 | 1 | N/A | Portsmouth, England | |
| Win | 5-0 | Anderson Silverio | Submission (Soccer Kicks) | Meca Vale Tudo 12 | July 9, 2005 | 1 | 7:33 | Rio de Janeiro, Brazil | |
| Win | 4-0 | Aritano Barbosa | KO (Soccer Kicks) | Rio MMA Challenge 1 | May 12, 2005 | 1 | 0:22 | Rio de Janeiro, Brazil | |
| Win | 3-0 | Luiz de Paula | Submission (Arm-Triangle Choke) | Shooto Brazil 7 | March 19, 2005 | 1 | 0:56 | Rio de Janeiro, Brazil | |
| Win | 2-0 | Hudson Rocha | TKO (Doctor Stoppage) | Shooto Brazil: Never Shake | October 23, 2004 | 1 | 5:00 | São Paulo, Brazil | |
| Win | 1-0 | Mario Bigola | KO (Head Kick and Soccer Kick) | EcoFight 1 | August 10, 2004 | 1 | 0:18 | Amapá, Brazil | |
