Swimming at the 2003 Pan American Games – Men's 4 × 100 metre freestyle relay

The Men's 4 × 100 m Freestyle Relay event at the 2003 Pan American Games took place on August 15, 2003 (Day 15 of the Games). Brazil won the men's 4 × 100 free relay in 3:18.66, just short of their Games record from four years ago. Venezuela was second and Canada was third. The USA was disqualified when the second swimmer Jayme Cramer left early.