The men's discus throw at the 2010 World Junior Championships in Athletics was held at the Moncton 2010 Stadium on 23 & 24 July. A 1.75 kg (junior implement) discus was used.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Andrius Gudžius | Andrei Gag | Julian Wruck |
Prior to the competition, the existing world junior and championship records were as follows.
24 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left |  | 60.80 | 63.45 | 62.49 | 63.41 | 63.78 | x | 63.78 | ||||
| align=left | align=left |  | 61.85 | 59.93 | x | 59.77 | x | x | 61.85 | PB | |||
| align=left | align=left |  | 59.88 | 61.09 | 60.65 | x | 60.87 | 60.55 | 61.09 | ||||
| 4 | align=left | align=left |  | 58.24 | 43.55 | 59.96 | 60.54 | 55.94 | 58.96 | 60.54 | |||
| 5 | align=left | align=left |  | 57.44 | 60.04 | 60.33 | x | x | 58.37 | 60.33 | |||
| 6 | align=left | align=left | x | 48.90 | 58.49 | 59.77 | 59.18 | x | 59.77 | ||||
| 7 | align=left | align=left | | x | 51.20 | 58.11 | 59.59 | 57.41 | 55.85 | 59.59 | |||
| 8 | align=left | align=left | 58.14 | x | 59.51 | x | 57.39 | x | 59.51 | ||||
| 9 | align=left | align=left | 57.81 | 56.80 | 54.62 | 57.81 | |||||||
| 10 | align=left | align=left |  | 55.27 | 56.91 | x | 56.91 | ||||||
| 11 | align=left | align=left |  | 56.08 | 53.13 | x | 56.08 | ||||||
| 12 | align=left | align=left |  | 54.64 | x | x | 54.64 | ||||||
23 July
Qualification standard 59.40m or at least best 12 qualified.
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 45.83 | 45.75 | 52.47 | 59.87 | Q | ||
| 2 | align=left | align=left | | 57.82 | x | 59.59 | 59.59 | Q | ||
| 3 | align=left | align=left | 57.24 | x | 59.56 | 59.56 | Q | |||
| 4 | align=left | align=left | x | 58.57 | 57.48 | 58.57 | q | |||
| 5 | align=left | align=left | | 57.71 | 53.92 | x | 57.71 | q | ||
| 6 | align=left | align=left | | 56.99 | x | x | 56.99 | q | ||
| 7 | align=left | align=left |  | 55.32 | x | 56.08 | 56.08 | |||
| 8 | align=left | align=left |  | 55.85 | x | 55.70 | 55.85 | |||
| 9 | align=left | align=left |  | 55.33 | x | 55.05 | 55.33 | |||
| 10 | align=left | align=left | | x | 53.46 | x | 53.46 | |||
| 11 | align=left | align=left | | 51.47 | 53.00 | 52.60 | 53.00 | |||
| 12 | align=left | align=left |  | x | x | 48.69 | 52.47 | |||
| 13 | align=left | align=left |  | x | 52.11 | x | 52.11 | |||
| 14 | align=left | align=left |  | 49.39 | 51.75 | 50.25 | 51.75 | |||
| 15 | align=left | align=left |  | 50.63 | 51.12 | 50.16 | 51.12 | |||
| 16 | align=left | align=left | | 46.78 | 49.51 | 48.14 | 49.51 | |||
| 17 | align=left | align=left |  | 59.87 | - | - | 48.69 | |||
| align=left | align=left | x | x | x | NM | |||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | x | 55.57 | 63.14 | 63.14 | Q | ||
| 2 | align=left | align=left | | 60.90 | - | - | 60.90 | Q | ||
| 3 | align=left | align=left | | 59.55 | - | - | 59.55 | Q | ||
| 4 | align=left | align=left | 58.25 | 58.48 | x | 58.48 | q | |||
| 5 | align=left | align=left | | 57.59 | 58.36 | - | 58.36 | q | ||
| 6 | align=left | align=left | | 54.91 | x | 57.18 | 57.18 | q | ||
| 7 | align=left | align=left | | x | 54.52 | 55.84 | 55.84 | |||
| 8 | align=left | align=left | 52.87 | 54.90 | x | 54.90 | ||||
| 9 | align=left | align=left | 52.86 | 52.93 | 54.62 | 54.62 | ||||
| 10 | align=left | align=left | 52.27 | 54.33 | x | 54.33 | ||||
| 11 | align=left | align=left | 43.35 | 53.03 | 54.14 | 54.14 | ||||
| 12 | align=left | align=left |  | x | 54.05 | x | 54.05 | |||
| 13 | align=left | align=left |  | 52.18 | x | 48.28 | 52.18 | |||
| 14 | align=left | align=left |  | 50.35 | x | 49.02 | 50.35 | |||
| 15 | align=left | align=left |  | 34.90 | x | 47.72 | 47.72 | |||
| 16 | align=left | align=left |  | x | 44.83 | 42.21 | 44.83 | |||
| align=left | align=left |  | x | x | x | NM | ||||
According to an unofficial count, 35 athletes from 28 countries participated in the event.