The men's discus throw event at the 1986 World Junior Championships in Athletics was held in Athens, Greece, at Olympic Stadium on 16 and 17 July. A 2 kg (senior implement) discus was used.
| Gold | Vasil Baklarov | |
| Silver | Werner Reiterer | |
| Bronze | Vasiliy Kaptyukh |
17 July
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | 60.60 | |||||
| align=left | align=left | | 58.64 | ||||
| align=left | align=left | 58.22 | |||||
| 4 | align=left | align=left | 58.16 | ||||
| 5 | align=left | align=left |  | 58.04 | |||
| 6 | align=left | align=left | 56.16 | ||||
| 7 | align=left | align=left | 54.00 | ||||
| 8 | align=left | align=left | 53.82 | ||||
| 9 | align=left | align=left | | 53.70 | |||
| 10 | align=left | align=left | 53.66 | ||||
| 11 | align=left | align=left | 53.12 | ||||
| 12 | align=left | align=left |  | 52.32 |
16 Jul
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 59.00 | Q | |||
| 2 | align=left | align=left | 52.92 | Q | |||
| 3 | align=left | align=left | 52.90 | Q | |||
| 4 | align=left | align=left | 51.46 | Q | |||
| 5 | align=left | align=left | 51.44 | Q | |||
| 6 | align=left | align=left | | 51.36 | Q | ||
| 7 | align=left | align=left | | 49.68 | q | ||
| 8 | align=left | align=left |  | 47.68 | |||
| 9 | align=left | align=left | 46.95 | ||||
| 10 | align=left | align=left |  | 46.76 | |||
| 11 | align=left | align=left |  | 46.02 | |||
| 12 | align=left | align=left |  | 45.42 | |||
| 13 | align=left | align=left | 43.42 | ||||
| 14 | align=left | align=left |  | 40.72 | |||
| 15 | align=left | align=left |  | 31.70 | |||
| align=left | align=left | NM | |||||
| align=left | align=left | NM |
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 57.18 | Q | ||
| 2 | align=left | align=left | 54.02 | Q | |||
| 3 | align=left | align=left | | 52.22 | Q | ||
| 4 | align=left | align=left | 52.20 | Q | |||
| 5 | align=left | align=left | 51.10 | Q | |||
| 6 | align=left | align=left | 49.66 | ||||
| 7 | align=left | align=left | | 48.82 | |||
| 8 | align=left | align=left | | 47.78 | |||
| 9 | align=left | align=left | 47.14 | ||||
| 10 | align=left | align=left | | 45.48 | |||
| 11 | align=left | align=left | 43.12 | ||||
| 12 | align=left | align=left |  | 42.78 | |||
| 13 | align=left | align=left | 40.98 | ||||
| 14 | align=left | align=left | 39.04 | ||||
| 15 | align=left | align=left | | 38.12 | |||
| 16 | align=left | align=left |  | 37.78 | |||
| 17 | align=left | align=left | 37.14 | ||||
| 18 | align=left | align=left | 35.42 |
According to an unofficial count, 35 athletes from 26 countries participated in the event.