Swimming at the 2024 World Aquatics Championships – Men's 800 metre freestyle

The men's 800 metre freestyle competition at the 2024 World Aquatics Championships was held on 13 and 14 February 2024.

Records
Prior to the competition, the existing world and championship records were as follows.

Heats
The heats were started on 13 February at 10:22

Final
The final was started on 14 February at 19:02.