The men's hammer throw event at the 2008 World Junior Championships in Athletics was held in Bydgoszcz, Poland, at Zawisza Stadium on 10 and 12 July. A 6 kg (junior implement) hammer was used.
| Gold | Walter Henning | |
| Silver | Conor McCullough | |
| Bronze | Aleh Dubitski |
12 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | 76.14 | x | 74.23 | 76.13 | 70.18 | 76.92 | 76.92 | ||||
| align=left | align=left | | 67.74 | 70.73 | 75.88 | 74.07 | 74.24 | 73.50 | 75.88 | ||||
| align=left | align=left | | x | 71.82 | 75.42 | x | x | x | 75.42 | ||||
| 4 | align=left | align=left |  | 71.78 | 75.31 | x | 72.76 | x | 75.24 | 75.31 | |||
| 5 | align=left | align=left | | 74.22 | x | x | 72.72 | x | 71.46 | 74.22 | |||
| 6 | align=left | align=left |  | 72.04 | 73.34 | 73.56 | 72.03 | x | x | 73.56 | |||
| 7 | align=left | align=left | | 72.58 | x | 73.31 | 71.56 | 72.03 | 72.55 | 73.31 | |||
| 8 | align=left | align=left |  | 69.57 | 72.97 | 72.95 | 72.16 | 72.75 | x | 72.97 | |||
| 9 | align=left | align=left |  | 70.37 | 72.26 | x | 72.26 | ||||||
| 10 | align=left | align=left |  | x | 65.11 | 70.77 | 70.77 | ||||||
| 11 | align=left | align=left | 69.23 | x | 70.41 | 70.41 | |||||||
| 12 | align=left | align=left |  | x | 65.93 | x | 65.93 | ||||||
10 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 72.22 | 72.86 | 70.70 | 72.86 | q | ||
| 2 | align=left | align=left | | x | x | 72.83 | 72.83 | q | ||
| 3 | align=left | align=left | | 68.37 | 71.69 | 71.99 | 71.99 | q | ||
| 4 | align=left | align=left | | 71.90 | 70.89 | x | 71.90 | q | ||
| 5 | align=left | align=left | | x | 66.10 | 71.43 | 71.43 | q | ||
| 6 | align=left | align=left | | x | 70.84 | x | 70.84 | q | ||
| 7 | align=left | align=left | 69.94 | x | 68.17 | 69.94 | q | |||
| 8 | align=left | align=left |  | 65.77 | 68.17 | 69.42 | 69.42 | |||
| 9 | align=left | align=left | x | 66.93 | 68.55 | 68.55 | ||||
| 10 | align=left | align=left | | x | 64.08 | 66.46 | 66.46 | |||
| 11 | align=left | align=left |  | 65.18 | 63.44 | x | 65.18 | |||
| 12 | align=left | align=left |  | 64.04 | 64.84 | 65.04 | 65.04 | |||
| 13 | align=left | align=left |  | x | 61.67 | x | 61.67 | |||
| 14 | align=left | align=left |  | x | 61.11 | x | 61.11 | |||
| align=left | align=left |  | x | x | x | NM | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 72.82 | x | 69.04 | 72.82 | q | ||
| 2 | align=left | align=left | | x | x | 71.84 | 71.84 | q | ||
| 3 | align=left | align=left | | 71.27 | 68.99 | 67.15 | 71.27 | q | ||
| 4 | align=left | align=left | | 70.42 | x | x | 70.42 | q | ||
| 5 | align=left | align=left | | 70.04 | 69.75 | 66.83 | 70.04 | q | ||
| 6 | align=left | align=left | | 67.59 | 69.19 | 66.69 | 69.19 | |||
| 7 | align=left | align=left | 69.02 | x | 68.32 | 69.02 | ||||
| 8 | align=left | align=left | | x | 68.07 | 64.98 | 68.07 | |||
| 9 | align=left | align=left | | x | 66.94 | x | 66.94 | |||
| 10 | align=left | align=left | | x | 66.75 | 61.14 | 66.75 | |||
| 11 | align=left | align=left |  | x | 64.76 | 62.06 | 64.76 | |||
| 12 | align=left | align=left | | 62.04 | 59.53 | 64.68 | 64.68 | |||
| 13 | align=left | align=left |  | 63.18 | x | 60.42 | 63.18 | |||
| 14 | align=left | align=left |  | x | 55.31 | 59.06 | 59.06 | |||
| 15 | align=left | align=left | | x | 55.33 | x | 55.33 | |||
According to an unofficial count, 30 athletes from 20 countries participated in the event.