The men's discus throw event at the 1998 World Junior Championships in Athletics was held in Annecy, France, at Parc des Sports on 29 and 30 July. A 2 kg (senior implement) discus was used.
| Gold | Zoltán Kővágó | |
| Silver | Emeka Udechuku | |
| Bronze | Gábor Máté |
30 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | x | 57.35 | 53.90 | 55.93 | 56.80 | 59.36 | 59.36 | ||||
| align=left | align=left | 56.10 | x | 55.91 | 55.44 | 57.99 | 57.39 | 57.99 | |||||
| align=left | align=left | | 55.71 | 56.96 | 55.95 | 56.09 | 56.29 | 51.91 | 56.96 | ||||
| 4 | align=left | align=left |  | 55.19 | x | 55.82 | 55.10 | 55.60 | 56.55 | 56.55 | |||
| 5 | align=left | align=left | 54.54 | 55.35 | 55.78 | 55.96 | x | 54.44 | 55.96 | ||||
| 6 | align=left | align=left | 48.06 | 55.43 | 51.27 | 55.75 | 53.37 | 55.60 | 55.75 | ||||
| 7 | align=left | align=left | 55.57 | 55.19 | x | 53.74 | x | 55.63 | 55.63 | ||||
| 8 | align=left | align=left |  | 53.30 | 52.21 | 51.64 | 51.90 | 52.24 | x | 53.30 | |||
| 9 | align=left | align=left |  | x | 52.75 | x | 52.75 | ||||||
| 10 | align=left | align=left | | x | 50.54 | 52.69 | 52.69 | ||||||
| 11 | align=left | align=left |  | x | 45.47 | 50.41 | 50.41 | ||||||
| 12 | align=left | align=left |  | 48.51 | x | 49.23 | 49.23 | ||||||
29 Jul
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 55.93 | - | - | 55.93 | Q | |||
| 2 | align=left | align=left | | 55.48 | - | - | 55.48 | Q | ||
| 3 | align=left | align=left | | 55.27 | - | - | 55.27 | Q | ||
| 4 | align=left | align=left | | x | 53.42 | - | 53.42 | Q | ||
| 5 | align=left | align=left | | 50.87 | x | 53.28 | 53.28 | Q | ||
| 6 | align=left | align=left | 53.05 | - | - | 53.05 | Q | |||
| 7 | align=left | align=left | | 52.15 | 52.48 | x | 52.48 | q | ||
| 8 | align=left | align=left |  | 48.53 | 44.51 | x | 48.53 | |||
| 9 | align=left | align=left | | 46.75 | 45.08 | 48.23 | 48.23 | |||
| 10 | align=left | align=left |  | 47.47 | 46.35 | 48.20 | 48.20 | |||
| 11 | align=left | align=left |  | 46.34 | 47.65 | 45.15 | 47.65 | |||
| 12 | align=left | align=left |  | 45.88 | 47.59 | x | 47.59 | |||
| 13 | align=left | align=left | 46.90 | 47.00 | 46.73 | 47.00 | ||||
| 14 | align=left | align=left | 38.92 | 43.26 | 44.60 | 44.60 | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 57.39 | - | - | 57.39 | Q | |||
| 2 | align=left | align=left | | 57.12 | - | - | 57.12 | Q | ||
| 3 | align=left | align=left | | 49.21 | 50.42 | 56.80 | 56.80 | Q | ||
| 4 | align=left | align=left | 52.87 | 53.47 | - | 53.47 | Q | |||
| 5 | align=left | align=left | | 50.74 | 49.94 | 52.05 | 52.05 | q | ||
| 6 | align=left | align=left |  | 51.91 | x | 51.80 | 51.91 | |||
| 7 | align=left | align=left | | 50.80 | 47.04 | 49.53 | 50.80 | |||
| 8 | align=left | align=left |  | 49.66 | x | 46.42 | 49.66 | |||
| 9 | align=left | align=left | 49.59 | 47.29 | 45.93 | 49.59 | ||||
| 10 | align=left | align=left |  | 41.05 | 49.14 | 47.71 | 49.14 | |||
| 11 | align=left | align=left | | 47.03 | 47.76 | x | 47.76 | |||
| 12 | align=left | align=left |  | x | 47.12 | x | 47.12 | |||
| 13 | align=left | align=left |  | 46.65 | 45.87 | 45.90 | 46.65 | |||
| 14 | align=left | align=left | | x | 46.07 | x | 46.07 | |||
According to an unofficial count, 28 athletes from 20 countries participated in the event.