| Swimming at the 2003 Pan American Games | ||
|---|---|---|
| | ||
| Freestyle | ||
| 50 m | men | women |
| 100 m | men | women |
| 200 m | men | women |
| 400 m | men | women |
| 800 m | women | |
| 1500 m | men | |
| Backstroke | ||
| 100 m | men | women |
| 200 m | men | women |
| Breaststroke | ||
| 100 m | men | women |
| 200 m | men | women |
| Butterfly | ||
| 100 m | men | women |
| 200 m | men | women |
| Individual medley | ||
| 200 m | men | women |
| 400 m | men | women |
| Freestyle relay | ||
| 4×100 m | men | women |
| 4×200 m | men | women |
| Medley relay | ||
| 4×100 m | men | women |
The Men's 400m Individual Medley event at the 2003 Pan American Games took place on August 13, 2003 (Day 12 of the Games).
| Gold | Robert Margalis |
| Silver | Eric Donnelly |
| Bronze | Thiago Pereira |
| Record | Athlete | Time | Date | Venue |
|---|---|---|---|---|
| World Record | 4:09.09 | 2003-07-27 | | |
| Pan Am Record | 4:15.52 | 1999-08-03 | |
| Place | Swimmer | Heats | Final | |
|---|---|---|---|---|
| Time | Rank | Time | ||
| 1 | 4:24.00 | 2 | 4:19.09 | |
| 2 | 4:23.52 | 1 | 4:19.65 | |
| 3 | 4:29.12 | 5 | 4:19.89 | |
| 4 | 4:27.05 | 3 | 4:22.04 NR | |
| 5 | 4:30.02 | 6 | 4:24.42 | |
| 6 | 4:29.02 | 4 | 4:25.85 | |
| 7 | 4:30.38 | 7 | 4:29.37 | |
| 8 | 4:32.96 | 8 | 4:33.62 | |
| 9 | 4:33.31 | 9 | 4:30.73 | |
| 10 | 4:41.81 | 11 | 4:34.72 | |
| 11 | 4:37.08 | 10 | 4:38.47 | |
| 12 | 4:43.73 | 12 | 4:38.66 | |
| 13 | 4:46.58 | 13 | 4:43.42 | |
| 14 | 4:47.40 | 14 | 4:47.91 | |
| — | 4:53.23 | 15 | scratched | |