The women's marathon event at the 2003 Pan American Games took place on Saturday, 9 August 2003. Brazil's Márcia Narloch won the title, defeating title defender Érika Olivera from Chile.
Medalists edit
| Gold | Márcia Narloch Brazil
|
| Silver | Mariela González Cuba
|
| Bronze | Érika Olivera Chile
|
Records edit
| World record |  Paula Radcliffe (GBR) |
2:15:25 | 13 April 2003 | London, Great Britain
|
| Pan Am record | Érika Olivera (CHI) |
2:37:41 | 25 July 1999 |  Winnipeg, Canada
|
Results edit
| Rank | Athlete | Time |
|---|---|---|
| 1 | Márcia Narloch (BRA) |
2:39:54 |
| 2 |  Mariela González (CUB) |
2:42:55 |
| 3 |  Érika Olivera (CHI) |
2:44:52 |
| 4 |  Iglandini González (COL) |
2:47:40 |
| 5 | Maria do Carmo Guimarães (BRA) |
2:51:58 |
| 6 |  Maribel Burgos (PUR) |
2:53:03 |
| 7 |  Angélica Sánchez (MEX) |
2:53:56 |
| 8 | Emperatriz Wilson (CUB) |
2:54:16 |
| 9 |  Stacie Albourcek (USA) |
2:55:14 |
| 10 | Kelly Flathers (USA) |
2:59:05 |
| 11 | Lourdes Cruz (PUR) |
3:04:12 |
| 12 |  Pascuala Beras (DOM) |
3:04:47 |
| 13 |  Adelaide Carrington (VIN) |
3:35:02 |
| — | Isabel Juárez (MEX) |
DNF |
| — |  Martha Tenorio (ECU) |
DNF |