| Event: | Bodybuilding |
| Games: | 2005 Southeast Asian Games |
| Venue: | GSIS Building |
| Location: | Pasay, Metro Manila |
| Date: | December 1–4 |
| Prev: | 2003 |
| Next: | 2007 |
Bodybuilding at the 2005 Southeast Asian Games was held at the Government Service Insurance System Theater in Pasay, Philippines. This sport is not included in the Olympic Games but is included as one of the events in the SEA Games since 2003.
As a sport, called competitive bodybuilding, bodybuilders display their physiques to a panel of judges, who assign points based on their aesthetic appearance.
| Light flyweight 55 kg | nowrap | |||
| Flyweight 60 kg | nowrap | |||
| Bantamweight 65 kg | ||||
| Lightweight 70 kg | nowrap | |||
| Welterweight 75 kg | ||||
| Light middleweight 80 kg |