The men's hammer throw event at the 1998 World Junior Championships in Athletics was held in Annecy, France, at Parc des Sports on 31 July and 1 August. A 7257g (senior implement) hammer was used.
| Gold | Olli-Pekka Karjalainen | |
| Silver | Yury Voronkin | |
| Bronze | Wojciech Kondratowicz |
1 August
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | x | 72.40 | 72.31 | x | x | 71.85 | 72.40 | ||||
| align=left | align=left | | 66.97 | 67.98 | 67.51 | x | 69.66 | x | 69.66 | ||||
| align=left | align=left | | 68.93 | 67.90 | 66.75 | x | x | x | 68.93 | ||||
| 4 | align=left | align=left | 66.31 | x | x | 67.59 | 68.36 | 67.81 | 68.36 | ||||
| 5 | align=left | align=left |  | 64.69 | x | 66.36 | 66.58 | 67.09 | x | 67.09 | |||
| 6 | align=left | align=left |  | x | 63.50 | 65.98 | 62.15 | x | 65.21 | 65.98 | |||
| 7 | align=left | align=left |  | 64.15 | 64.26 | 65.08 | 62.84 | x | 63.36 | 65.08 | |||
| 8 | align=left | align=left | | 64.42 | 63.83 | 64.75 | 62.51 | 63.43 | 63.05 | 64.75 | |||
| 9 | align=left | align=left | | 61.59 | 63.07 | 63.39 | 63.39 | ||||||
| 10 | align=left | align=left |  | 57.81 | 61.51 | 60.44 | 61.51 | ||||||
| 11 | align=left | align=left | | x | 60.20 | x | 60.20 | ||||||
| 12 | align=left | align=left | x | 54.09 | 59.58 | 59.58 | |||||||
31 Jul
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 69.39 | - | - | 69.39 | Q | ||
| 2 | align=left | align=left | | 65.93 | - | - | 65.93 | Q | ||
| 3 | align=left | align=left | | 63.76 | 65.13 | - | 65.13 | Q | ||
| 4 | align=left | align=left | | 58.77 | x | 64.36 | 64.36 | q | ||
| 5 | align=left | align=left | | 62.26 | 62.78 | 61.00 | 62.78 | q | ||
| 6 | align=left | align=left | | 59.29 | 60.50 | 62.52 | 62.52 | q | ||
| 7 | align=left | align=left |  | 62.08 | 61.25 | 61.14 | 62.08 | |||
| 8 | align=left | align=left |  | x | 58.98 | 60.02 | 60.02 | |||
| 9 | align=left | align=left |  | 58.46 | x | 56.53 | 58.46 | |||
| 10 | align=left | align=left |  | x | 55.58 | 54.58 | 55.58 | |||
| 11 | align=left | align=left | 54.50 | 53.16 | 51.77 | 54.50 | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 66.15 | - | - | 66.15 | Q | |||
| 2 | align=left | align=left | x | 65.87 | - | 65.87 | Q | |||
| 3 | align=left | align=left | | 65.86 | - | - | 65.86 | Q | ||
| 4 | align=left | align=left | | 64.36 | x | 65.34 | 65.34 | Q | ||
| 5 | align=left | align=left | | 63.87 | 62.53 | 64.07 | 64.07 | q | ||
| 6 | align=left | align=left | | 60.82 | 61.66 | 62.33 | 62.33 | q | ||
| 7 | align=left | align=left |  | 59.91 | 60.99 | x | 60.99 | |||
| 8 | align=left | align=left |  | 58.27 | 57.27 | x | 58.27 | |||
| 9 | align=left | align=left |  | 55.57 | 55.25 | 57.52 | 57.52 | |||
| 10 | align=left | align=left |  | x | 55.95 | 55.37 | 55.95 | |||
| 11 | align=left | align=left | 54.49 | x | x | 54.49 | ||||
| 12 | align=left | align=left |  | 38.80 | x | 43.73 | 43.73 | |||
According to an unofficial count, 23 athletes from 19 countries participated in the event.