| Event: | Boys' 800 metre freestyle |
| Competition: | 2018 Summer Youth Olympics |
| Year: | 2018 |
| Type: | Summer Youth Olympics |
| Venue: | Natatorium |
| Dates: | 11 October |
| Competitors: | 26 |
| Nations: | 22 |
| Win Value: | 7:50.20 |
| Gold: | Nguyễn Huy Hoàng |
| Goldnoc: | VIE |
| Silver: | Keisuke Yoshida |
| Silvernoc: | JPN |
| Bronze: | Marco De Tullio |
| Bronzenoc: | ITA |
| Prev: | 2014 |
| Next: | 2026 |
The boys' 800 metre freestyle event at the 2018 Summer Youth Olympics took place on 11 October at the Natatorium in Buenos Aires, Argentina.[1]
The heats were started at 10:00 and 18:00.[2]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 4 | 6 | 7:50.20 | NR | ||||
| 4 | 8 | 7:53.85 | |||||
| 4 | 1 | 7:55.81 | |||||
| 4 | 4 | 7:56.43 | |||||
| 4 | 5 | 8:01.93 | |||||
| 4 | 3 | 8:03.30 | |||||
| 2 | 3 | 8:04.43 | |||||
| 4 | 2 | 8:05.27 | |||||
| 3 | 7 | 8:09.43 | |||||
| 10 | 4 | 7 | 8:09.92 | ||||
| 11 | 3 | 3 | 8:09.97 | ||||
| 12 | 3 | 2 | 8:11.73 | ||||
| 13 | 3 | 6 | 8:11.82 | ||||
| 14 | 3 | 4 | 8:12.93 | ||||
| 15 | 2 | 4 | 8:13.49 | ||||
| 16 | 3 | 5 | 8:14.71 | ||||
| 17 | 3 | 8 | 8:16.06 | ||||
| 18 | 2 | 6 | 8:16.17 | ||||
| 19 | 2 | 7 | 8:17.62 | ||||
| 20 | 2 | 5 | 8:18.64 | ||||
| 21 | 2 | 1 | 8:22.27 | ||||
| 22 | 3 | 1 | 8:23.60 | ||||
| 23 | 2 | 2 | 8:24.48 | ||||
| 24 | 1 | 4 | 8:38.52 | ||||
| 25 | 1 | 5 | 8:47.04 | ||||
| 26 | 1 | 3 | 9:35.82 |