The men's triple jump event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 16 and 18 July.
| Gold | Khotso Mokoena | |
| Silver | Zhu Shujing | |
| Bronze | Viktor Kuznyetsov |
18 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | 16.58 (w: -0.1 m/s) | x | 16.68 (w: -0.5 m/s) | 16.77 (w: -0.3 m/s) | 16.62 (w: -0.1 m/s) | 14.86 (w: +0.1 m/s) | 16.77 (w: -0.3 m/s) | |||||
| align=left | align=left | | 16.64 (w: +0.1 m/s) | 16.59 (w: +0.1 m/s) | x | 16.43 (w: -0.4 m/s) | x | 16.35 (w: -0.2 m/s) | 16.64 (w: +0.1 m/s) | ||||
| align=left | align=left | | 16.58 (w: 0.0 m/s) | 16.54 (w: +0.7 m/s) | 16.30 (w: +0.8 m/s) | 15.98 (w: -0.1 m/s) | 15.87 (w: +0.1 m/s) | 15.87 (w: -0.1 m/s) | 16.58 (w: 0.0 m/s) | ||||
| 4 | align=left | align=left |  | 16.21 (w: +0.1 m/s) | 16.30 (w: -0.3 m/s) | 16.14 (w: +0.4 m/s) | 13.68 (w: -0.5 m/s) | 16.20 (w: -0.1 m/s) | 15.84 (w: +0.1 m/s) | 16.30 (w: -0.3 m/s) | |||
| 5 | align=left | align=left |  | 16.29 (w: +0.5 m/s) | 16.03 (w: -0.3 m/s) | 16.16 (w: +0.6 m/s) | 16.05 (w: -0.2 m/s) | x | x | 16.29 (w: +0.5 m/s) | |||
| 6 | align=left | align=left |  | 16.17 (w: +1.0 m/s) | 15.44 (w: 0.0 m/s) | 15.82 (w: +1.0 m/s) | 15.89 (w: -0.5 m/s) | 15.80 (w: 0.0 m/s) | - | 16.17 (w: +1.0 m/s) | |||
| 7 | align=left | align=left |  | 15.61 (w: +0.8 m/s) | 15.78 (w: +1.2 m/s) | x | x | 15.86 (w: -0.4 m/s) | 15.63 (w: +0.4 m/s) | 15.86 (w: -0.4 m/s) | |||
| 8 | align=left | align=left | 15.79 (w: +1.1 m/s) | x | 15.60 (w: +0.3 m/s) | x | x | x | 15.79 (w: +1.1 m/s) | ||||
| 9 | align=left | align=left | 15.66 (w: -0.1 m/s) | 15.57 (w: -0.2 m/s) | 15.73 (w: +0.7 m/s) | 15.73 (w: +0.7 m/s) | |||||||
| 10 | align=left | align=left |  | 15.68 (w: -0.1 m/s) | x | 15.62 (w: -0.4 m/s) | 15.68 (w: -0.1 m/s) | ||||||
| 11 | align=left | align=left |  | 15.63 (w: -0.3 m/s) | x | 15.21 (w: +0.1 m/s) | 15.63 (w: -0.3 m/s) | ||||||
| 12 | align=left | align=left | | 15.20 (w: -0.4 m/s) | - | - | 15.20 (w: -0.4 m/s) | ||||||
16 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 16.39 (w: +0.2 m/s) | - | - | 16.39 (w: +0.2 m/s) | Q | ||
| 2 | align=left | align=left | | x | x | 16.25 (w: -0.4 m/s) | 16.25 (w: -0.4 m/s) | Q | ||
| 3 | align=left | align=left | | 16.15 (w: -0.2 m/s) | - | - | 16.15 (w: -0.2 m/s) | Q | ||
| 4 | align=left | align=left | 15.06 (w: +0.8 m/s) | 16.00 (w: -0.5 m/s) | - | 16.00 (w: -0.5 m/s) | Q | |||
| 5 | align=left | align=left | | 15.74 (w: -0.1 m/s) | 15.55 (w: 0.0 m/s) | x | 15.74 (w: -0.1 m/s) | q | ||
| 6 | align=left | align=left | | 15.22 (w: -0.8 m/s) | 14.99 (w: +0.3 m/s) | 15.73 (w: -0.2 m/s) | 15.73 (w: -0.2 m/s) | q | ||
| 7 | align=left | align=left |  | 15.38 (w: +0.5 m/s) | 15.62 (w: +0.1 m/s) | 15.72 (w: -0.1 m/s) | 15.72 (w: -0.1 m/s) | |||
| 8 | align=left | align=left |  | 15.67 (w: -0.2 m/s) | 13.88 (w: -0.1 m/s) | 14.25 (w: +0.2 m/s) | 15.67 (w: -0.2 m/s) | |||
| 9 | align=left | align=left | 15.31 (w: +0.4 m/s) | 15.36 (w: -0.5 m/s) | 14.98 (w: +0.2 m/s) | 15.36 (w: -0.5 m/s) | ||||
| 10 | align=left | align=left |  | x | x | 15.34 (w: +0.1 m/s) | 15.34 (w: +0.1 m/s) | |||
| 11 | align=left | align=left |  | 15.33 (w: +0.2 m/s) | x | 15.18 (w: -0.1 m/s) | 15.33 (w: +0.2 m/s) | |||
| 12 | align=left | align=left | 14.96 (w: -0.3 m/s) | 15.06 (w: -0.1 m/s) | x | 15.06 (w: -0.1 m/s) | ||||
| 13 | align=left | align=left |  | 14.83 (w: -0.2 m/s) | 14.89 (w: +0.5 m/s) | 14.87 (w: -0.2 m/s) | 14.89 (w: +0.5 m/s) | |||
| 14 | align=left | align=left |  | x | x | 14.77 (w: +0.6 m/s) | 14.77 (w: +0.6 m/s) | |||
| 15 | align=left | align=left | 14.70 (w: -0.1 m/s) | x | 14.69 (w: +0.2 m/s) | 14.70 (w: -0.1 m/s) | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 15.80 (w: +0.8 m/s) | 16.02 (w: +0.1 m/s) | - | 16.02 (w: +0.1 m/s) | Q | |||
| 2 | align=left | align=left | | 16.01 (w: -0.3 m/s) | - | - | 16.01 (w: -0.3 m/s) | Q | ||
| 3 | align=left | align=left | | 15.72 (w: +1.2 m/s) | 15.93 (w: -0.1 m/s) | 15.84 (w: 0.0 m/s) | 15.93 (w: -0.1 m/s) | q | ||
| 4 | align=left | align=left | | 15.70 (w: +0.5 m/s) | 15.85 (w: +0.6 m/s) | 15.40 (w: 0.0 m/s) | 15.85 (w: +0.6 m/s) | q | ||
| 5 | align=left | align=left | 15.16 (w: +0.8 m/s) | 15.47 (w: +0.1 m/s) | 15.76 (w: +0.2 m/s) | 15.76 (w: +0.2 m/s) | q | |||
| 6 | align=left | align=left | | 15.76 (w: -0.3 m/s) | x | 15.42 (w: -0.2 m/s) | 15.76 (w: -0.3 m/s) | q | ||
| 7 | align=left | align=left |  | 14.96 (w: +0.6 m/s) | 15.62 (w: +0.8 m/s) | x | 15.62 (w: +0.8 m/s) | |||
| 8 | align=left | align=left | | 15.29 (w: -0.3 m/s) | 15.37 (w: -0.1 m/s) | 15.40 (w: -0.4 m/s) | 15.40 (w: -0.4 m/s) | |||
| 9 | align=left | align=left | | 15.10 (w: -0.4 m/s) | 15.15 (w: +0.5 m/s) | 15.19 (w: +0.2 m/s) | 15.19 (w: +0.2 m/s) | |||
| 10 | align=left | align=left | | 15.17 (w: +0.4 m/s) | 15.17 (w: 0.0 m/s) | 14.99 (w: +0.2 m/s) | 15.17 (w: +0.4 m/s) | |||
| 11 | align=left | align=left | | 14.95 (w: +0.3 m/s) | 14.75 (w: +0.3 m/s) | 15.14 (w: +0.2 m/s) | 15.14 (w: +0.2 m/s) | |||
| 12 | align=left | align=left | 14.82 (w: +0.2 m/s) | 15.00 (w: 0.0 m/s) | x | 15.00 (w: 0.0 m/s) | ||||
| 13 | align=left | align=left | | 14.81 (w: -0.2 m/s) | - | - | 14.81 (w: -0.2 m/s) | |||
| 14 | align=left | align=left |  | x | 14.43 (w: +0.2 m/s) | 14.62 (w: +0.2 m/s) | 14.62 (w: +0.2 m/s) | |||
| 15 | align=left | align=left | 14.53 (w: +0.4 m/s) | x | 14.14 (w: -0.1 m/s) | 14.53 (w: +0.4 m/s) | ||||
| align=left | align=left |  | x | x | - | NM | ||||
According to an unofficial count, 31 athletes from 23 countries participated in the event.