The men's water polo tournament at the 2023 World Aquatics Championships was held from 17 to 29 July 2023.

This was the 20th time that the men's water polo tournament has been played since the first edition in 1973.

[1] Hungary claimed their fourth title by defeating Greece in the final.

[2] Due the limited budget and the proximity of the date of the championship with the 2023 Pan American Games, Brazil opted for the withdrawal before the tournament and was replaced by Argentina.

[6] The draw resulted in the following groups: All times are local (UTC+9).