The men's javelin throw event at the 1998 World Junior Championships in Athletics was held in Annecy, France, at Parc des Sports on 31 July and 2 August.
| Gold | David Parker | |
| Silver | Hardus Pienaar | |
| Bronze | Yukifumi Murakami |
2 August
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | 72.85 | 67.03 | 70.83 | 69.85 | x | x | 72.85 | |||||
| align=left | align=left | 63.20 | 61.12 | 67.44 | 66.19 | 71.16 | x | 71.16 | |||||
| align=left | align=left | | 66.87 | 70.72 | 63.22 | 69.78 | 68.98 | x | 70.72 | ||||
| 4 | align=left | align=left |  | 68.14 | 67.52 | x | 66.77 | 68.70 | 69.95 | 69.95 | |||
| 5 | align=left | align=left |  | 61.67 | 69.17 | x | 64.08 | 67.64 | 59.18 | 69.17 | |||
| 6 | align=left | align=left | 66.30 | 64.73 | 59.82 | 63.47 | 61.67 | 62.98 | 66.30 | ||||
| 7 | align=left | align=left |  | 66.12 | x | 61.48 | 63.62 | 65.99 | x | 66.12 | |||
| 8 | align=left | align=left | 66.10 | x | x | 61.62 | 63.37 | 64.45 | 66.10 | ||||
| 9 | align=left | align=left |  | 65.61 | x | 64.11 | 65.61 | ||||||
| 10 | align=left | align=left | 64.32 | x | 58.61 | 64.32 | |||||||
| 11 | align=left | align=left | | 62.88 | x | 63.72 | 63.72 | ||||||
| 12 | align=left | align=left |  | x | 62.53 | 60.74 | 62.53 | ||||||
31 Jul
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 67.63 | 72.73 | - | 72.73 | Q | ||
| 2 | align=left | align=left | | 69.65 | 68.35 | 68.20 | 69.65 | q | ||
| 3 | align=left | align=left | 65.15 | 65.81 | 69.44 | 69.44 | q | |||
| 4 | align=left | align=left | | 67.90 | x | x | 67.90 | q | ||
| 5 | align=left | align=left | 67.64 | x | 65.26 | 67.64 | q | |||
| 6 | align=left | align=left | 66.06 | 66.50 | 66.01 | 66.50 | q | |||
| 7 | align=left | align=left | 64.23 | 63.50 | 66.10 | 66.10 | q | |||
| 8 | align=left | align=left | | 62.85 | 65.60 | 63.45 | 65.60 | q | ||
| 9 | align=left | align=left |  | 64.17 | 64.29 | 65.29 | 65.29 | |||
| 10 | align=left | align=left | 58.75 | 61.90 | 61.04 | 61.90 | ||||
| 11 | align=left | align=left | 60.55 | 58.95 | 56.70 | 60.55 | ||||
| 12 | align=left | align=left |  | 58.54 | x | x | 58.54 | |||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 72.06 | - | - | 72.06 | Q | ||
| 2 | align=left | align=left | | 67.53 | 66.86 | 68.67 | 68.67 | q | ||
| 3 | align=left | align=left | 66.57 | x | 67.29 | 67.29 | q | |||
| 4 | align=left | align=left | | 66.20 | x | 65.86 | 66.20 | q | ||
| 5 | align=left | align=left |  | 61.77 | 63.12 | 65.01 | 65.01 | |||
| 6 | align=left | align=left |  | 63.82 | 61.37 | 58.93 | 63.82 | |||
| 7 | align=left | align=left |  | 62.02 | 62.46 | 63.49 | 63.49 | |||
| 8 | align=left | align=left |  | x | x | 61.37 | 61.37 | |||
| 9 | align=left | align=left | x | 60.34 | 59.43 | 60.34 | ||||
| 10 | align=left | align=left | | 56.37 | 60.06 | 59.58 | 60.06 | |||
| 11 | align=left | align=left |  | 59.39 | 59.04 | 59.55 | 59.55 | |||
| 12 | align=left | align=left | 58.56 | 58.37 | 59.15 | 59.15 | ||||
| 13 | align=left | align=left | 58.80 | 58.76 | 57.61 | 58.80 | ||||
According to an unofficial count, 25 athletes from 20 countries participated in the event.