The Welterweight competition was the fifth-highest weight class featured at the 2009 World Amateur Boxing Championships, and was held at the Mediolanum Forum. Welterweights were limited to a maximum of 69 kilograms in body mass.
| Gold | Jack Culcay-Keth |
| Silver | Andrey Zamkovoy |
| Bronze | Botirjon Mahmudov |
| Serik Sapiyev |
Carlos Banteux (third round)
Serik Sapiyev (semifinals)
Magomed Nurutdinov (second round)
Oscar Molina (third round)
Jaoid Chiguer (second round)
Botirjon Mahmudov (semifinals)
Omar Mamedshayev (first round)