The Men's Boxing Tournament at the 1963 Pan American Games was held in São Paulo, Brazil, from April 20 to May 5.
| Flyweight ( - 51 kilograms) | Floreal García |  Pedro Dias |  Robert Carmody | |
| Bantamweight ( - 54 kilograms) |  Abel Almaraz |  Marcíal Guttiérez | Arthur Jones | |
| Featherweight ( - 57 kilograms) | Rosemiro Mateus | Héctor Pace | Charles Brown | |
| Lightweight ( - 60 kilograms) |  Roberto Caminero | João da Silva |  Barry Foster | |
| Light Welterweight ( - 63.5 kilograms) | Adolfo Moreira | Orlando Nuñes | Quincey Daniels | |
| Welterweight ( - 67 kilograms) | Miguel Villugron | Rubens Vasconcelos | Mario Pereyra | |
| Light Middleweight ( - 71 kilograms) | Elecio Neves |  Manuel Sánchez | Osvaldo Mariño | |
| Middleweight ( - 75 kilograms) | Luiz Cézar | Leonardo Alcolea |  Fidel Odreman | |
| Light Heavyweight ( - 81 kilograms) | Fred Lewis | Ronald Holmes | Ruben Alves | |
| Heavyweight (+ 81 kilograms) | Lee Carr | José E. Jorge | Raul Aguilar |