Athletics at the 2003 Pan American Games – Women's 400 metres
# Athletics at the 2003 Pan American Games – Women's 400 metres

The final of the Women's 400 metres event at the 2003 Pan American Games took place on Friday August 8, 2003, with the heats staged a day earlier. Hazel-Ann Regis won the only silver medal for Grenada at the 2003 Pan American Games.

## Medalists

| Gold | Ana Guevara Mexico |
| - | - |
| Silver | Hazel-Ann Regis Grenada |
| Bronze | Aliann Pompey Guyana |

## Records

| World Record | Marita Koch (GDR) | 47.60 | October 6, 1985 | Canberra, Australia |
| - | - | - | - | - |
| Pan Am Record | Ana Fidelia Quirot (CUB) | 49.61 | August 5, 1991 | Havana, Cuba |

## Results

| Rank | Athlete | Heats | Heats | Final |
| - | - | - | - | - |
| Rank | Athlete | Time | Rank | Time |
| 1 | Ana Guevara (MEX) | 52.22 | 2 | 50.36 |
| 2 | Hazel-Ann Regis (GRN) | 52.21 | 1 | 51.56 |
| 3 | Aliann Pompey (GUY) | 52.23 | 3 | 52.06 |
| 4 | Libania Grenot (CUB) | 52.37 | 4 | 52.23 |
| 5 | Me'Lisa Barber (USA) | 52.62 | 5 | 52.53 |
| 6 | Novlene Williams (JAM) | 52.76 | 7 | 52.83 |
| 7 | Moushami Robinson (USA) | 52.23 | 6 | 52.96 |
| 8 | Michelle Burgher (JAM) | 53.13 | 8 | 53.26 |
| 9 | Josiane Tito (BRA) | 53.18 | 9 |
| 10 | Geisa Coutinho (BRA) | 53.23 | 10 |
| 11 | Patricia Libia Rodríguez (COL) | 53.41 | 11 |
| 12 | Mayra González (MEX) | 53.53 | 12 |
| 13 | Adia McKinnon (TRI) | 54.24 | 13 |
| 14 | Clara Hernández (DOM) | 55.22 | 14 |
| 15 | Jackie-Ann Morain (GRN) | 56.30 | 15 |
| 16 | Mirtha Brock (COL) | 1:01.79 | 16 |
| — | Eliana Pacheco (VEN) | DNF | — |
| — | Tonique Williams-Darling (BAH) | DNS | — |
