| March 20 (preliminaries and finals)|
The men's 1500 metre freestyle competition of the swimming events at the 1955 Pan American Games took place on 20 March. The last Pan American Games champion was Tetsuo Okamoto of Brazil.
This race consisted of thirty lengths of the pool, all lengths being in freestyle.
Swimming at the 1955 Pan American Games – Men's 1500 metre freestyle Wikipedia
All times are in minutes and seconds.
The final was held on March 20.