The men's long jump event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 13 and 14 July.
| Gold | Andrew Howe | |
| Silver | Khotso Mokoena | |
| Bronze | John Thornell |
14 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | 7.94 (w: +1.0 m/s) | 7.74 (w: 0.0 m/s) | 7.68 (w: -0.2 m/s) | 7.70 (w: +0.7 m/s) | 8.11 (w: +0.9 m/s) | 7.85 (w: +0.4 m/s) | 8.11 (w: +0.9 m/s) | ||||
| align=left | align=left | 7.80 (w: 0.0 m/s) | 7.84 (w: +0.3 m/s) | 7.99 (w: 0.0 m/s) | 8.00 (w: +0.9 m/s) | 8.09 (w: +0.7 m/s) | 8.06 (w: +0.7 m/s) | 8.09 (w: +0.7 m/s) | |||||
| align=left | align=left | | 7.71 (w: -0.4 m/s) | 7.77 (w: -0.9 m/s) | 7.89 (w: +0.3 m/s) | x | 7.77 (w: +1.1 m/s) | 7.85 (w: -0.1 m/s) | 7.89 (w: +0.3 m/s) | ||||
| 4 | align=left | align=left | | 7.53 (w: -0.3 m/s) | 7.50 (w: +0.2 m/s) | 7.44 (w: -0.1 m/s) | 7.36 (w: +0.7 m/s) | 7.63 (w: +1.0 m/s) | 7.66 (w: +0.9 m/s) | 7.66 (w: +0.9 m/s) | |||
| 5 | align=left | align=left |  | 7.58 (w: +0.8 m/s) | x | 7.66 (w: +0.5 m/s) | 7.41 (w: +0.5 m/s) | x | x | 7.66 (w: +0.5 m/s) | |||
| 6 | align=left | align=left |  | x | 7.48 (w: +0.4 m/s) | 7.39 (w: +1.1 m/s) | 7.55 (w: +1.2 m/s) | x | 7.45 (w: +0.5 m/s) | 7.55 (w: +1.2 m/s) | |||
| 7 | align=left | align=left |  | 7.52 (w: +0.7 m/s) | x | x | 7.23 (w: +0.8 m/s) | 7.51 (w: +0.9 m/s) | x | 7.52 (w: +0.7 m/s) | |||
| 8 | align=left | align=left | 7.21 (w: +0.9 m/s) | 7.35 (w: 0.0 m/s) | 7.49 (w: -0.2 m/s) | 7.35 (w: +0.4 m/s) | 7.29 (w: +1.4 m/s) | 7.37 (w: +0.7 m/s) | 7.49 (w: -0.2 m/s) | ||||
| 9 | align=left | align=left | | 7.26 (w: 0.0 m/s) | 7.43 (w: +1.2 m/s) | 7.19 (w: +0.4 m/s) | 7.43 (w: +1.2 m/s) | ||||||
| 10 | align=left | align=left |  | 7.17 (w: 0.0 m/s) | 7.14 (w: +0.5 m/s) | 7.35 (w: +0.4 m/s) | 7.35 (w: +0.4 m/s) | ||||||
| 11 | align=left | align=left |  | 7.34 (w: +0.2 m/s) | 7.18 (w: +0.4 m/s) | 5.12 (w: +0.6 m/s) | 7.34 (w: +0.2 m/s) | ||||||
| 12 | align=left | align=left |  | 7.10 (w: +0.9 m/s) | 6.96 (w: +0.6 m/s) | x | 7.10 (w: +0.9 m/s) | ||||||
13 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 7.76 (w: -0.8 m/s) | - | - | 7.76 (w: -0.8 m/s) | Q | ||
| 2 | align=left | align=left | 7.57 (w: -0.4 m/s) | 7.67 (w: -0.6 m/s) | - | 7.67 (w: -0.6 m/s) | Q | |||
| 3 | align=left | align=left | | 7.62 (w: +0.7 m/s) | 7.53 (w: -0.1 m/s) | - | 7.62 (w: +0.7 m/s) | q | ||
| 4 | align=left | align=left | | x | 7.19 (w: -0.4 m/s) | 7.48 (w: +0.7 m/s) | 7.48 (w: +0.7 m/s) | q | ||
| 5 | align=left | align=left | | 7.39 (w: +0.4 m/s) | 7.43 (w: +0.3 m/s) | 7.25 (w: 0.0 m/s) | 7.43 (w: +0.3 m/s) | q | ||
| 6 | align=left | align=left | 7.30 (w: +0.5 m/s) | 7.21 (w: +0.3 m/s) | 7.34 (w: 0.0 m/s) | 7.34 (w: 0.0 m/s) | q | |||
| 7 | align=left | align=left |  | 7.34 (w: -1.2 m/s) | x | 7.23 (w: -0.1 m/s) | 7.34 (w: -1.2 m/s) | |||
| 8 | align=left | align=left |  | 7.33 (w: -0.8 m/s) | 5.93 (w: -0.1 m/s) | 7.19 (w: +0.6 m/s) | 7.33 (w: -0.8 m/s) | |||
| 9 | align=left | align=left |  | 7.15 (w: -0.9 m/s) | 7.28 (w: -0.4 m/s) | 7.27 (w: +0.8 m/s) | 7.28 (w: -0.4 m/s) | |||
| 10 | align=left | align=left | | 7.24 (w: +0.3 m/s) | 7.28 (w: +0.4 m/s) | x | 7.28 (w: +0.4 m/s) | |||
| 11 | align=left | align=left | 4.58 (w: -3.3 m/s) | 5.40 (w: +0.5 m/s) | 7.27 (w: +0.1 m/s) | 7.27 (w: +0.1 m/s) | ||||
| 12 | align=left | align=left |  | 7.12 (w: +0.6 m/s) | 7.07 (w: +0.4 m/s) | 6.82 (w: -0.2 m/s) | 7.12 (w: +0.6 m/s) | |||
| 13 | align=left | align=left |  | 6.99 (w: -0.8 m/s) | 6.78 (w: -0.6 m/s) | 6.60 (w: +0.3 m/s) | 6.99 (w: -0.8 m/s) | |||
| 14 | align=left | align=left |  | 6.78 (w: 0.0 m/s) | 6.73 (w: +0.1 m/s) | x | 6.78 (w: 0.0 m/s) | |||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 7.69 (w: -1.5 m/s) | - | - | 7.69 (w: -1.5 m/s) | Q | ||
| 2 | align=left | align=left | | x | 7.52 (w: -0.3 m/s) | - | 7.52 (w: -0.3 m/s) | q | ||
| 3 | align=left | align=left | | 6.87 (w: -1.0 m/s) | 7.29 (w: 0.0 m/s) | 7.47 (w: -0.8 m/s) | 7.47 (w: -0.8 m/s) | q | ||
| 4 | align=left | align=left | | x | 7.35 (w: +0.1 m/s) | 7.34 (w: -0.8 m/s) | 7.35 (w: +0.1 m/s) | q | ||
| 5 | align=left | align=left | | 7.26 (w: -0.7 m/s) | x | 7.35 (w: -0.6 m/s) | 7.35 (w: -0.6 m/s) | q | ||
| 6 | align=left | align=left | | 7.31 (w: -0.3 m/s) | 7.34 (w: 0.0 m/s) | 7.29 (w: +0.2 m/s) | 7.34 (w: 0.0 m/s) | q | ||
| 7 | align=left | align=left | 7.05 (w: -1.2 m/s) | 7.05 (w: -0.4 m/s) | 7.22 (w: -0.3 m/s) | 7.22 (w: -0.3 m/s) | ||||
| 8 | align=left | align=left |  | 6.70 (w: -1.2 m/s) | 7.13 (w: -0.5 m/s) | 7.18 (w: +0.3 m/s) | 7.18 (w: +0.3 m/s) | |||
| 9 | align=left | align=left |  | 7.12 (w: -1.2 m/s) | 7.00 (w: -1.1 m/s) | 7.06 (w: +0.3 m/s) | 7.12 (w: -1.2 m/s) | |||
| 10 | align=left | align=left | 7.06 (w: -0.7 m/s) | 6.11 (w: 0.0 m/s) | x | 7.06 (w: -0.7 m/s) | ||||
| 11 | align=left | align=left | 6.55 (w: -0.1 m/s) | 7.02 (w: -1.0 m/s) | 6.81 (w: +0.5 m/s) | 7.02 (w: -1.0 m/s) | ||||
| 12 | align=left | align=left | | 6.98 (w: -0.2 m/s) | x | x | 6.98 (w: -0.2 m/s) | |||
| 13 | align=left | align=left | 5.78 (w: -0.4 m/s) | 6.18 (w: +0.4 m/s) | 6.93 (w: -0.8 m/s) | 6.93 (w: -0.8 m/s) | ||||
According to an unofficial count, 27 athletes from 22 countries participated in the event.