The men's 400m freestyle events at the 2023 World Para Swimming Championships were held at the Manchester Aquatics Centre between 31 July and 6 August.
A straight final was held on Tuesday 1 August.
9 swimmers took part in this event, with both the heats and final on Friday 4 August.
[15] 8 swimmers took part in this event, with both the heats and final on Sunday 6 August.
11 swimmers took part in this event, with both the heats and final on Saturday 5 August.