The men's 800 metres competition of the athletics events at the 2019 Pan American Games took place between the 9 and 10 of August at the 2019 Pan American Games Athletics Stadium.

The defending Pan American Games champion before the 2019 Games was Clayton Murphy from the United States.

Prior to this competition, the existing world and Pan American Games records were as follows: All times shown are in seconds.

The heats took place on 9 August at 15:50.

The results were as follows:[1] Qualification: First 3 in each heat (Q) and the next 2 fastest (q) advance to the Final The final took place on 10 August at 14:55.