Swimming at the 2003 Pan American Games – Men's 400 metre individual medley

The Men's 400m Individual Medley event at the 2003 Pan American Games took place on August 13, 2003 (Day 12 of the Games).

Medalists

Gold	Robert Margalis United States
Silver	Eric Donnelly United States
Bronze	Thiago Pereira Brazil

World Record	Michael Phelps (USA)	4:09.09	2003-07-27	Barcelona, Spain
Pan Am Record	Curtis Myden (CAN)	4:15.52	1999-08-03	Winnipeg, Canada

Place	Swimmer	Heats		Final
Place	Swimmer	Time	Rank	Time
1	Robert Margalis (USA)	4:24.00	2	4:19.09
2	Eric Donnelly (USA)	4:23.52	1	4:19.65
3	Thiago Pereira (BRA)	4:29.12	5	4:19.89
4	Jeremy Knowles (BAH)	4:27.05	3	4:22.04 NR
5	Bradley Ally (BAR)	4:30.02	6	4:24.42
6	Diogo Yabe (BRA)	4:29.02	4	4:25.85
7	Tobias Oriwol (CAN)	4:30.38	7	4:29.37
8	Andrew Mackay (CAY)	4:32.96	8	4:33.62

9	Chad Murray (CAN)	4:33.31	9	4:30.73
10	Shaune Fraser (CAY)	4:41.81	11	4:34.72
11	Marcos Burgos (CHI)	4:37.08	10	4:38.47
12	Hiram Carrion (PUR)	4:43.73	12	4:38.66
13	Vincent van Rutten (AHO)	4:46.58	13	4:43.42
14	Jonathan Mauri (CRC)	4:47.40	14	4:47.91
—	Kieran Locke (ISV)	4:53.23	15	scratched