Athletics at the 2003 Pan American Games – Men's marathon
# Athletics at the 2003 Pan American Games – Men's marathon

The men's marathon event at the 2003 Pan American Games took place on Saturday, 9 August 2003. Brazil's title defender Vanderlei de Lima once again proved to be the best marathoner, clocking a winning time of 2h 19m 08s.

## Medalists

| Gold | Vanderlei de Lima Brazil |
| - | - |
| Silver | Bruce Deacon Canada |
| Bronze | Diego Colorado Colombia |

## Records

| World record | Khalid Khannouchi (USA) | 2:05:38 | 14 April 2002 | London, Great Britain |
| - | - | - | - | - |
| Pan Am record | Jorge González (PUR) | 2:12:43 | 28 August 1983 | Caracas, Venezuela |

## Results

| Rank | Athlete | Time |
| - | - | - |
| 1 | Vanderlei de Lima (BRA) | 2:19:08 |
| 2 | Bruce Deacon (CAN) | 2:20:25 |
| 3 | Diego Colorado (COL) | 2:21:48 |
| 4 | Aguelmis Rojas (CUB) | 2:23:18 |
| 5 | Francisco Bautista (MEX) | 2:25:50 |
| 6 | Daniel Simbrón (ARG) | 2:28:21 |
| 7 | Pamenos Ballantyne (VIN) | 2:29:37 |
| 8 | Chris Banks (USA) | 2:32:22 |
| 9 | Hugo Jiménez (COL) | 2:35:26 |
| 10 | Jeff Campbell (USA) | 2:36:31 |
| 11 | Cristian Villavicencio (NCA) | 2:37:28 |
| 12 | Larry Alberto Sánchez (VEN) | 2:42:02 |
| 13 | José Francisco Paulino (DOM) | 2:43:11 |
| — | Silvio Guerra (ECU) | DNF |
| — | Genílson da Silva (BRA) | DNF |
| — | Bernardo Jiménez (DOM) | DNF |
| — | Alfredo Arévalo (GUA) | DNF |
| — | Luis Fonseca (VEN) | DNF |
| — | Benjamín Paredes (MEX) | DNF |
