The Heavyweight competition was the second-highest weight class featured at the 2009 World Amateur Boxing Championships, and was held at the Mediolanum Forum. Heavyweights were limited to a maximum of 91 kilograms in body mass.
| Gold | Egor Mekhontsev |
| Silver | Osmay Acosta |
| Bronze | John M'Bumba |
| Oleksandr Usyk |
Osmay Acosta (final)
Clemente Russo (third round)
Oleksandr Usyk (semifinals)
John M'Bumba (semifinals)
Mohamed Arjaoui (quarterfinals)
Jahon Qurbonov (second round)
Tsolak Ananikyan (first round)
Jozsef Darmos (third round)