The men's long jump event at the 2008 World Junior Championships in Athletics was held in Bydgoszcz, Poland, at Zawisza Stadium on 8 and 9 July.
| Gold | Marquise Goodwin | |
| Silver | Dzmitry Astrouski | |
| Bronze | Eusebio Cáceres |
9 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | 7.74 (w: -1.0 m/s) | x | 7.62 (w: -0.2 m/s) | 7.51 (w: -0.3 m/s) | x | 7.48 (w: -0.4 m/s) | 7.74 (w: -1.0 m/s) | ||||
| align=left | align=left | | 7.64 (w: -1.4 m/s) | 5.50 (w: -0.3 m/s) | 5.55 (w: -0.3 m/s) | 7.27 (w: -0.5 m/s) | 7.27 (w: -0.1 m/s) | 6.98 (w: -0.3 m/s) | 7.64 (w: -1.4 m/s) | ||||
| align=left | align=left | | 7.41 (w: -0.3 m/s) | x | 7.45 (w: -0.5 m/s) | x | 7.38 (w: -0.4 m/s) | 7.59 (w: -0.2 m/s) | 7.59 (w: -0.2 m/s) | ||||
| 4 | align=left | align=left | 7.40 (w: -0.8 m/s) | 7.57 (w: -1.1 m/s) | 7.20 (w: -0.4 m/s) | 7.35 (w: 0.0 m/s) | 7.41 (w: -0.1 m/s) | 7.13 (w: 0.0 m/s) | 7.57 (w: -1.1 m/s) | ||||
| 5 | align=left | align=left |  | 7.43 (w: -1.2 m/s) | x | 7.46 (w: -0.1 m/s) | 7.24 (w: -0.5 m/s) | 7.31 (w: 0.0 m/s) | 7.43 (w: -0.5 m/s) | 7.46 (w: -0.1 m/s) | |||
| 6 | align=left | align=left | 7.29 (w: -1.6 m/s) | 7.24 (w: -0.3 m/s) | 7.42 (w: -0.5 m/s) | 7.17 (w: -0.8 m/s) | 7.18 (w: -0.1 m/s) | 7.07 (w: -0.8 m/s) | 7.42 (w: -0.5 m/s) | ||||
| 7 | align=left | align=left | | 7.37 (w: -0.7 m/s) | x | 7.41 (w: -0.1 m/s) | 7.22 (w: -0.3 m/s) | 7.02 (w: -0.6 m/s) | 7.22 (w: -0.2 m/s) | 7.41 (w: -0.1 m/s) | |||
| 8 | align=left | align=left | 6.99 (w: -0.9 m/s) | 7.40 (w: -0.3 m/s) | 7.38 (w: 0.0 m/s) | 7.27 (w: -0.2 m/s) | 7.38 (w: -0.3 m/s) | 7.30 (w: -0.2 m/s) | 7.40 (w: -0.3 m/s) | ||||
| 9 | align=left | align=left |  | x | 7.14 (w: -0.2 m/s) | 7.35 (w: -0.4 m/s) | 7.35 (w: -0.4 m/s) | ||||||
| 10 | align=left | align=left |  | 7.16 (w: -1.1 m/s) | 7.21 (w: -0.1 m/s) | 7.08 (w: -0.4 m/s) | 7.21 (w: -0.1 m/s) | ||||||
| 11 | align=left | align=left |  | x | 6.93 (w: -0.3 m/s) | 7.02 (w: -0.4 m/s) | 7.02 (w: -0.4 m/s) | ||||||
| 12 | align=left | align=left | x | x | 6.73 (w: -0.5 m/s) | 6.73 (w: -0.5 m/s) | |||||||
8 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 7.60 (w: -1.8 m/s) | 7.07 (w: -0.4 m/s) | 7.59 (w: -0.5 m/s) | 7.60 (w: -1.8 m/s) | q | ||
| 2 | align=left | align=left | | 7.38 (w: -2.6 m/s) | 6.85 (w: -0.2 m/s) | 7.12 (w: -0.1 m/s) | 7.38 (w: -2.6 m/s) | q | ||
| 3 | align=left | align=left | | 7.14 (w: -0.5 m/s) | x | 7.36 (w: -2.2 m/s) | 7.36 (w: -2.2 m/s) | q | ||
| 4 | align=left | align=left | 7.07 (w: -0.3 m/s) | 7.32 (w: -0.6 m/s) | x | 7.32 (w: -0.6 m/s) | q | |||
| 5 | align=left | align=left | 6.99 (w: -0.6 m/s) | 7.25 (w: -2.4 m/s) | 7.30 (w: -1.5 m/s) | 7.30 (w: -1.5 m/s) | q | |||
| 6 | align=left | align=left |  | 7.01 (w: -1.8 m/s) | 7.23 (w: -2.1 m/s) | 6.90 (w: -0.2 m/s) | 7.23 (w: -2.1 m/s) | |||
| 7 | align=left | align=left |  | 7.18 (w: -0.4 m/s) | x | 7.22 (w: -1.5 m/s) | 7.22 (w: -1.5 m/s) | |||
| 8 | align=left | align=left |  | 7.19 (w: -0.1 m/s) | 6.91 (w: -0.9 m/s) | x | 7.19 (w: -0.1 m/s) | |||
| 9 | align=left | align=left | | x | 5.41 (w: -0.7 m/s) | 7.17 (w: -0.5 m/s) | 7.17 (w: -0.5 m/s) | |||
| 10 | align=left | align=left |  | 7.15 (w: -2.6 m/s) | 6.88 (w: -0.3 m/s) | 6.78 (w: -0.5 m/s) | 7.15 (w: -2.6 m/s) | |||
| 11 | align=left | align=left |  | 7.01 (w: -0.9 m/s) | x | 7.08 (w: -0.8 m/s) | 7.08 (w: -0.8 m/s) | |||
| 12 | align=left | align=left | 6.99 (w: -2.1 m/s) | 7.02 (w: -0.8 m/s) | 6.77 (w: -0.5 m/s) | 7.02 (w: -0.8 m/s) | ||||
| 13 | align=left | align=left |  | 6.93 (w: -0.1 m/s) | 6.43 (w: -2.1 m/s) | 6.90 (w: -1.1 m/s) | 6.93 (w: -0.1 m/s) | |||
| 14 | align=left | align=left |  | x | x | 6.87 (w: -0.4 m/s) | 6.87 (w: -0.4 m/s) | |||
| 15 | align=left | align=left | 6.74 (w: -0.5 m/s) | 6.85 (w: -1.3 m/s) | 6.57 (w: -1.2 m/s) | 6.85 (w: -1.3 m/s) | ||||
| align=left | align=left |  | x | x | x | NM | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 7.27 (w: -0.8 m/s) | x | 7.77 (w: -1.8 m/s) | 7.77 (w: -1.8 m/s) | Q | ||
| 2 | align=left | align=left | | 7.53 (w: -1.9 m/s) | 6.97 (w: -0.7 m/s) | 7.68 (w: -1.8 m/s) | 7.68 (w: -1.8 m/s) | q | ||
| 3 | align=left | align=left | | 7.56 (w: -1.3 m/s) | - | - | 7.56 (w: -1.3 m/s) | q | ||
| 4 | align=left | align=left | | 7.27 (w: 0.0 m/s) | 7.55 (w: -1.6 m/s) | 7.32 (w: -0.1 m/s) | 7.55 (w: -1.6 m/s) | q | ||
| 5 | align=left | align=left | | 7.48 (w: -1.7 m/s) | 7.44 (w: -2.2 m/s) | 7.33 (w: -0.9 m/s) | 7.48 (w: -1.7 m/s) | q | ||
| 6 | align=left | align=left | 7.48 (w: -1.6 m/s) | x | 7.33 (w: -1.7 m/s) | 7.48 (w: -1.6 m/s) | q | |||
| 7 | align=left | align=left | 7.39 (w: -1.2 m/s) | x | x | 7.39 (w: -1.2 m/s) | q | |||
| 8 | align=left | align=left | 6.96 (w: -0.7 m/s) | 7.25 (w: -1.8 m/s) | 7.13 (w: -1.2 m/s) | 7.25 (w: -1.8 m/s) | ||||
| 9 | align=left | align=left |  | x | x | 7.15 (w: -2.2 m/s) | 7.15 (w: -2.2 m/s) | |||
| 10 | align=left | align=left | | 7.11 (w: 0.0 m/s) | x | x | 7.11 (w: 0.0 m/s) | |||
| 11 | align=left | align=left | 6.89 (w: -0.2 m/s) | 6.99 (w: -1.5 m/s) | 6.80 (w: -0.3 m/s) | 6.99 (w: -1.5 m/s) | ||||
| 12 | align=left | align=left | | 6.60 (w: -2.4 m/s) | x | 6.99 (w: -0.4 m/s) | 6.99 (w: -0.4 m/s) | |||
| 13 | align=left | align=left |  | 6.94 (w: -0.4 m/s) | 6.81 (w: NWI) | 6.58 (w: -1.1 m/s) | 6.94 (w: -0.4 m/s) | |||
| 14 | align=left | align=left | | 6.74 (w: -1.3 m/s) | 6.89 (w: -2.3 m/s) | 6.84 (w: 0.0 m/s) | 6.89 (w: -2.3 m/s) | |||
According to an unofficial count, 30 athletes from 24 countries participated in the event.