2016 IAAF World U20 Championships – Men's 800 metres
The men's 800 metres event at the 2016 IAAF World U20 Championships was held at Zdzisław Krzyszkowiak Stadium on 22, 23 and 24 July.Medalists
Records
Results
Heats
Qualification: First 4 of each heat and the 4 fastest times qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 3 | Riadh Chninni | | 1:48.40 | Q |
| 2 | 3 | Teddese Lemi | | 1:48.45 | Q |
| 3 | 3 | Robert Heppenstall | | 1:48.69 | Q |
| 4 | 3 | Lachlan Barber | | 1:48.82 | Q |
| 5 | 2 | Willy Kiplimo Tarbei | | 1:48.95 | Q |
| 6 | 3 | Benediktas Mickus | | 1:49.05 | q |
| 7 | 2 | Ayoub Sniba | | 1:49.20 | Q |
| 8 | 2 | Gorata Gabankitse | | 1:49.29 | Q |
| 9 | 3 | Vincent Crisp | | 1:49.32 | q |
| 10 | 5 | James Preston | | 1:49.69 | Q |
| 11 | 2 | Ignacio Fontes | | 1:49.69 | Q |
| 12 | 1 | Mostafa Smaili | | 1:49.82 | Q |
| 13 | 5 | Ryan Sánchez | | 1:49.97 | Q |
| 14 | 2 | Pascal Kleyer | | 1:50.18 | q |
| 15 | 1 | Andreas Kramer | | 1:50.19 | Q |
| 16 | 5 | Jesús Tonatiu López | | 1:50.33 | Q |
| 17 | 1 | George Kusche | | 1:50.40 | Q |
| 18 | 5 | Daniel Rowden | | 1:50.69 | Q |
| 19 | 5 | Michael Petersen | | 1:50.77 | q |
| 19 | 4 | Kipyegon Bett | | 1:50.82 | Q |
| 20 | 1 | Bacha Morka | | 1:50.88 | Q |
| 21 | 2 | Mateusz Borkowski | | 1:50.93 | |
| 23 | 4 | Brian Bell | | 1:50.97 | Q |
| 24 | 5 | Andriy Aliksiychuk | | 1:51.39 | |
| 25 | 1 | Beant Singh | | 1:51.73 | |
| 26 | 4 | Joseph Deng | | 1:51.77 | Q |
| 27 | 4 | Dennis Biederbick | | 1:52.03 | Q |
| 28 | 1 | Ramazan Barbaros | | 1:52.42 | |
| 29 | 4 | Spencer Thomas | | 1:52.54 | |
| 30 | 4 | Markus Einan | | 1:53.61 | |
| 31 | 1 | Bilal Bilano | | 1:54.26 | PB |
| 32 | 2 | Gabriele Aquaro | | 1:55.92 | |
| 33 | 4 | Justice Dreischor | | 1:57.74 | |
Semifinals
Qualification: First 2 of each heat and the 2 fastest times qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 3 | Kipyegon Bett | | 1:46.37 | Q |
| 2 | 1 | Mostafa Smaili | | 1:46.51 | Q |
| 3 | 1 | Riadh Chninni | | 1:47.11 | Q, NU20R |
| 4 | 1 | Robert Heppenstall | | 1:47.13 | q |
| 5 | 3 | Jesús Tonatiu López | | 1:47.25 | Q |
| 6 | 1 | Brian Bell | | 1:47.49 | q |
| 7 | 3 | George Kusche | | 1:47.53 | |
| 8 | 3 | Teddese Lemi | | 1:47.53 | PB |
| 9 | 1 | Andreas Kramer | | 1:47.65 | PB |
| 10 | 1 | Dennis Biederbick | | 1:47.70 | PB |
| 11 | 1 | James Preston | | 1:48.06 | NU20R |
| 12 | 2 | Willy Kiplimo Tarbei | | 1:48.27 | Q |
| 13 | 2 | Gorata Gabankitse | | 1:48.31 | Q, PB |
| 14 | 2 | Joseph Deng | | 1:48.49 | |
| 15 | 2 | Vincent Crisp | | 1:48.63 | |
| 16 | 2 | Ignacio Fontes | | 1:48.88 | |
| 17 | 3 | Lachlan Barber | | 1:48.91 | |
| 18 | 2 | Ryan Sánchez | | 1:49.43 | |
| 19 | 3 | Benediktas Mickus | | 1:49.44 | |
| 20 | 3 | Daniel Rowden | | 1:49.58 | |
| 21 | 2 | Pascal Kleyer | | 1:49.84 | |
| 22 | 1 | Bacha Morka | | 1:51.27 | |
| 23 | 2 | Michael Petersen | | 1:51.76 | |
| 24 | 3 | Ayoub Sniba | | 1:53.86 | |
Final
| Rank | Name | Nationality | Time | Note |
| Kipyegon Bett | | 1:44.95 | SB |
| Willy Kiplimo Tarbei | | 1:45.50 | |
| Mostafa Smaili | | 1:46.02 | |
| 4 | Jesús Tonatiu López | | 1:46.70 | |
| 5 | Robert Heppenstall | | 1:47.33 | |
| 6 | Riadh Chninni | | 1:47.38 | |
| 7 | Brian Bell | | 1:47.68 | |
| 8 | Gorata Gabankitse | | 1:48.40 | |
