| Women's 400 metres hurdles at the Pan American Games |
|---|
| Athletics at the 2003 Pan American Games | ||
|---|---|---|
| | ||
| Track events | ||
| 100 m | men | women |
| 200 m | men | women |
| 400 m | men | women |
| 800 m | men | women |
| 1500 m | men | women |
| 5000 m | men | women |
| 10,000 m | men | women |
| 100 m hurdles | women | |
| 110 m hurdles | men | |
| 400 m hurdles | men | women |
| 3000 m steeplechase | men | |
| 4 × 100 m relay | men | women |
| 4 × 400 m relay | men | women |
| Road events | ||
| Marathon | men | women |
| 20 km walk | men | women |
| 50 km walk | men | |
| Field events | ||
| High jump | men | women |
| Pole vault | men | women |
| Long jump | men | women |
| Triple jump | men | women |
| Shot put | men | women |
| Discus throw | men | women |
| Hammer throw | men | women |
| Javelin throw | men | women |
| Combined events | ||
| Heptathlon | women | |
| Decathlon | men | |
The final of the Women's 400 metres Hurdles event at the 2003 Pan American Games took place on Wednesday August 6, 2003, with the heats staged a day earlier. America's Joanna Hayes was the only woman to go under the 55-seconds barrier, clocking 54.77 in the final.
| Gold | Joanna Hayes |
| Silver | Daimí Pernía |
| Bronze | Andrea Blackett |
| World Record | 52.61 s | August 11, 1995 | | |
| Pan Am Record | 53.44 s | July 28, 1999 | |
| Rank | Athlete | Heats | Final | |
|---|---|---|---|---|
| Time | Rank | Time | ||
| 1 | 55.64 | 1 | 54.77 | |
| 2 | 55.77 | 3 | 55.10 | |
| 3 | 55.86 | 5 | 55.24 | |
| 4 | 55.76 | 2 | 55.27 | |
| 5 | 55.79 | 4 | 55.27 | |
| 6 | 56.85 | 8 | 55.50 | |
| 7 | 55.97 | 6 | 56.73 | |
| 8 | 56.33 | 7 | 57.56 | |
| 9 | 57.44 | 9 | ||
| 10 | 57.92 | 10 | ||
| 11 | 58.42 NR | 11 | ||
| 12 | 1:00.28 | 12 | ||