The Men's 1500m Freestyle event at the 2003 Pan American Games took place on August 17, 2003 (Day 16 of the Games).
Ricardo Monasterio won the gold medal, breaking a string of 12 U.S. titles in a row. Before him, only other non-American had won the race, the Brazilian Tetsuo Okamoto, in the first edition of the Games in 1951.
| 14:34.56 | 2001-07-29 | ||||
| 15:13.90 | 1995-03-17 |  Mar del Plata, Argentina |
| Place | Swimmer | Time | |
|---|---|---|---|
| 1 | 15:16.98 | ||
| 2 | 15:19.63 | ||
| 3 | 15:19.64 | ||
| 4 | 15:41.41 | ||
| 5 | 15:52.40 | ||
| 6 | 15:54.84 | ||
| 7 | 16:00.99 | ||
| 8 | 16:05.59 |