The men's 800 metre freestyle competition of the swimming events at the 2019 Pan American Games was held on August 8, 2019 at the Villa Deportiva Nacional Videna cluster.

[1] Prior to this competition, the existing World Record was as follows: As there was no existing Pan American Games record in the event, the following record was established during the competition: The final round was held on August 8.

[2][3][4][5]