| Final | time | gap | L | Reac | 200m | 400m | 600m | | 1. Robert Finke |  United States | 7:41.87 | | 3 | 0.75 | 1:54.974. | 3:51.972. | 5:48.965. | | 2. Gregorio Paltrinieri |  Italy | 7:42.11 | 0.24s | 8 | 0.78 | 1:52.861. | 3:50.551. | 5:48.051. | | 3. Mykhailo Romanchuk |  Ukraine | 7:42.33 | 0.46s | 4 | 0.72 | 1:54.883. | 3:51.98=3. | 5:48.502. | | 4. Florian Wellbrock |  Germany | 7:42.68 | 0.81s | 5 | 0.69 | 1:54.792. | 3:51.995. | 5:48.703. | | 5. Jack McLoughlin |  Australia | 7:45.00 | 3.13s | 7 | 0.71 | 1:55.176. | 3:52.547. | 5:50.126. | | 6. Serhii Frolov | Ukraine | 7:45.11 | 3.24s | 1 | 0.72 | 1:55.227. | 3:51.98=3. | 5:48.784. | | 7. Felix Auboeck |  Austria | 7:49.14 | 7.27s | 6 | 0.76 | 1:55.075. | 3:52.266. | 5:50.457. | | 8. Guilherme Costa |  Brazil | 7:53.31 | 11.44s | 2 | 0.69 | 1:55.488. | 3:54.038. | 5:53.808. |
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| Final Ranking | | 1. Robert Finke | USA | | 2. Gregorio Paltrinieri | ITA | | 3. Mykhailo Romanchuk | UKR |
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| World Record: Lin Zhang, China 7:32.12 Rome, Italy 29th July 2009 |
| Final Ranking | Heats | Final | | 1. Robert Finke | United States | 7:42.723. | 7:41.871. | | 2. Gregorio Paltrinieri | Italy | 7:47.738. | 7:42.112. | | 3. Mykhailo Romanchuk | Ukraine | 7:41.281. | 7:42.333. | | 4. Florian Wellbrock | Germany | 7:41.772. | 7:42.684. | | 5. Jack McLoughlin | Australia | 7:46.946. | 7:45.005. | | 6. Serhii Frolov | Ukraine | 7:47.677. | 7:45.116. | | 7. Felix Auboeck | Austria | 7:45.734. | 7:49.147. | | 8. Guilherme Costa | Brazil | 7:46.095. | 7:53.318. | | 9. Henrik Christiansen |  Norway | 7:48.37 | | | | 10.Victor Johansson |  Sweden | 7:49.14 | | | | 10.Ahmed Hafnaoui |  Tunisia | 7:49.14 | | | | 12.Gabriele Detti | Italy | 7:49.47 | | | | 13.Aleksandr Egorov |  ROC | 7:49.97 | | | | 14.Daniel Wiffen |  Ireland | 7:51.65 | | | | 15.Alfonso Mestre |  Venezuela | 7:52.07 | | | | 16.Marwan Aly Elkamash |  Egypt | 7:52.76 | | | | 17.Michael Brinegar | United States | 7:53.00 | | | | 18.Zac Reid |  New Zealand | 7:53.06 | | | | 19.Alexander Norgaard |  Denmark | 7:53.50 | | | | 20.Huy Hoang Nguyen |  Vietnam | 7:54.16 | | | | 21.Anton Ipsen | Denmark | 7:54.98 | | | | 22.Akos Kalmar |  Hungary | 7:55.85 | | | | 23.Jose Lopes |  Portugal | 7:56.15 | | | | 24.Yigit Aslan |  Turkey | 7:56.18 | | | | 25.Kieran Bird |  Great Britain | 7:57.53 | | | | 26.Dimitrios Markos |  Greece | 7:58.68 | | | | 27.Long Cheng |  China | 7:58.71 | | | | 28.Jan Micka |  Czechia | 7:59.04 | | | | 29.David Aubry |  France | 8:00.16 | | | | 30.Ilia Druzhinin | ROC | 8:01.47 | | | | 31.Marcelo Acosta |  El Salvador | 8:03.01 | | | | 32.Martin Bau |  Slovenia | 8:04.79 | | | | 33.Vuk Celic |  Serbia | 8:04.85 | | | | 34.Konstantinos Englezakis | Greece | DNS | | |
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| First time this event was held. | | Men 800m Freestyle History | | Venue: Olympic Aquatics Centre 東京アクアティクスセンター. | | -- swimmers from -- nations. | | Olympic Qualifyng Time (OQT) - 7:54.31 (20) NOC can enter up to 2 swimmers with OQT. | | Olympic Selection Time (OST) - 8:08.54 (33) invitational - A swwimer meeting the "invitation" standard was eligible for entry. But this entry was allotted/filled by ranking. | | Semifinals | | Heats | | Qualification |
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| Total eligible to participate -- swimmers (started --) |
| Olympic Qualifying Time - 7:54.31 | | Olympic Selection Time - 8:08.54 |
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