The Men's 20 km Race Walking event at the 2003 Pan American Games took place on Tuesday August 5, 2003. Ecuador's Jefferson Pérez regained the title he lost four years earlier to Bernardo Segura. The title defender from Mexico ended up in second place this time.
Medalists edit
| Gold | Jefferson Pérez Ecuador
|
| Silver | Bernardo Segura Mexico
|
| Bronze | Alejandro López Mexico
|
Records edit
| World Record |  Paquillo Fernández (ESP) |
1:17:22 | April 28, 2002 |  Turku, Finland
|
| Pan Am Record | Bernardo Segura (MEX) |
1:20:17 | July 26, 1999 |  Winnipeg, Canada
|
Results edit
| Rank | Athlete | Time |
|---|---|---|
| 1 |  Jefferson Pérez (ECU) |
1:23:06 |
| 2 |  Bernardo Segura (MEX) |
1:23:31 |
| 3 | Alejandro López (MEX) |
1:24:33 |
| 4 |  Luis Fernando López (COL) |
1:27:32 |
| 5 | Fredy Hernández (COL) |
1:28:07 |
| 6 |  Cristian Muñoz (CHI) |
1:31:07 |
| 7 |  Timothy Seaman (USA) |
1:33:24 |
| 8 | John Nunn (USA) |
1:35:34 |
| 9 |  Edwin Centeno (PER) |
1:39:16 |
| 10 |  José Ramón Henríquez (DOM) |
1:42:50 |
| 11 | Fraulin Caminero (DOM) |
1:49:41 |
| — |  Luis Fernando García (GUA) |
DNF |
| — | Fausto Quinde (ECU) |
DNF |
| — | Julio René Martínez (GUA) |
DSQ |
| — |  José Alessandro Bagio (BRA) |
DSQ |