The final of the Men'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. Dominican Republic's Félix Sánchez set a new Pan American Games record in the final, clocking 48.19 seconds.
Medalists
edit| Gold | Félix Sánchez Dominican Republic
|
| Silver | Eric Thomas United States
|
| Bronze | Dean Griffiths Jamaica
|
Records
edit| World Record | Kevin Young (USA) |
46.78 s | August 6, 1992 |  Barcelona, Spain
|
| Pan Am Record |  Eronilde de Araújo (BRA) |
48.23 s | July 28, 1999 |  Winnipeg, Canada
|
Results
edit| Rank | Athlete | Heats | Final | |
|---|---|---|---|---|
| Time | Rank | Time | ||
| 1 |  Félix Sánchez (DOM) |
48.99 | 2 | 48.19 |
| 2 |  Eric Thomas (USA) |
48.91 | 1 | 48.74 |
| 3 |  Dean Griffiths (JAM) |
49.08 | 3 | 49.35 |
| 4 |  Oscar Juanz (MEX) |
50.31 | 7 | 50.28 |
| 5 | Regan Nichols (USA) |
50.01 | 5 | 50.31 |
| 6 |  Sergio Hierrezuelo (CUB) |
50.37 | 8 | 50.34 |
| 7 |  Adam Kunkel (CAN) |
50.00 | 4 | 50.43 |
| 8 | Eronilde de Araújo (BRA) |
50.21 | 6 | 51.19 |
| 9 | Miguel García (DOM) |
50.89 | 9 | |
| 10 |  Douglas Lynes-Bell (BAH) |
51.12 | 10 | |
| 11 |  Shane Charles (GRN) |
51.15 [1] | 11 | |
| 12 |  Michael Aguilar (BIZ) |
51.55 [2] | 12 | |
| 13 |  Fitz Allan Crick (VIN) |
51.83 | 13 | |
| 14 | Damarius Cash (BAH) |
53.54 | 14 | |
| 15 |  Jonnie Lowe (HON) |
54.40 | 15 | |