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

Qualification

Each National Federation was permitted to enter a maximum of two qualified athletes in each individual event, but only if both of them had attained the "A" standard qualification time at approved qualifying events. For this event, the "A" standard qualification time was 7:53.11. Federations could enter one athlete into the event if they met the "B" standard qualification time. For this event, the "B" standard qualification time was 8:09.67. Athletes could also enter the event if they had met an "A" or "B" standard in a different event and their Federation had not entered anyone else. Additional considerations applied to Federations who had few swimmers enter through the standard qualification times. Federations in this category could at least enter two men and two women into the competition, all of whom could enter into up to two events.

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

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

Rank Heat Lane Name Nationality Time Notes 1 4 2 Luca De Tullio 7:46.52 Q 2 4 4 Daniel Wiffen 7:46.90 Q 3 5 5 Sven Schwarz 7:46.95 Q 4 4 9 Victor Johansson 7:47.04 Q, NR 5 5 1 Kristóf Rasovszky 7:47.19 Q 6 5 3 Mykhailo Romanchuk 7:47.20 Q 7 4 3 Gregorio Paltrinieri 7:47.38 Q 8 5 6 Elijah Winnington 7:47.59 Q 9 5 7 David Betlehem 7:48.06 10 4 5 Florian Wellbrock 7:48.17 11 3 7 David Johnston 7:48.20 12 5 8 Kuzey Tunçelli 7:48.53 NR 13 4 1 Alfonso Mestre 7:48.84 14 2 4 Dimitrios Markos 7:49.97 NR 15 3 3 Carlos Garach Benito 7:50.56 16 3 1 Fei Liwei 7:51.18 17 5 0 Henrik Christiansen 7:51.21 18 5 4 Ahmed Hafnaoui 7:51.72 19 2 3 Lucas Henveaux 7:52.10 NR 20 4 7 Damien Joly 7:53.42 21 3 8 Ilia Sibirtsev 7:53.87 NR 22 3 5 Charlie Clark 7:54.87 23 5 9 Zhang Zhanshuo 7:55.86 24 4 8 Jon Joentvedt 7:56.28 25 3 9 Shogo Takeda 7:57.54 26 3 6 Felix Auböck 7:57.63 27 4 6 Guilherme Costa 7:58.02 28 2 2 Khiew Hoe Yean 8:02.78 NR 29 3 2 Nguyễn Huy Hoàng 8:05.17 30 2 6 Dylan Porges 8:05.83 31 4 0 Vlad Stancu 8:06.50 32 2 1 Ratthawit Thammananthachote 8:06.82 NR 33 3 4 Marc-Antoine Olivier 8:08.54 34 2 7 Glen Lim Jun Wei 8:09.34 35 3 0 Juan Morales 8:11.31 36 2 8 Diego Dulieu 8:11.97 37 2 9 Loris Bianchi 8:17.70 NR 38 1 4 Ilias El Fallaki 8:27.22 39 1 5 Alberto Vega 8:30.93 40 1 3 Liggjas Joensen 8:32.54 41 1 6 Mal Gashi 8:35.97 42 2 0 Rodolfo Falcón Jr. 8:38.90 43 1 2 Mohammed Al-Zaki 9:06.29 2 5 Antonio Djakovic 5 2 Kim Woo-min

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

Rank Lane Name Nationality Time Notes 5 Daniel Wiffen 7:40.94 8 Elijah Winnington 7:42.95 1 Gregorio Paltrinieri 7:42.98 4 3 Sven Schwarz 7:44.29 5 2 Kristóf Rasovszky 7:44.42 NR 6 6 Victor Johansson 7:47.08 7 4 Luca De Tullio 7:49.79 8 7 Mykhailo Romanchuk 7:54.51

References

Sources