The men's 110 metres hurdles event at the 1986 World Junior Championships in Athletics was held in Athens, Greece, at Olympic Stadium on 18 and 19 July. 106.7 cm (3'6) (senior implement) hurdles were used.
| Gold | Colin Jackson | |
| Silver | Jon Ridgeon | |
| Bronze | Emilio Valle |
19 July
Wind: -0.8 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | 13.44 | |||||
| align=left | align=left | 13.91 | |||||
| align=left | align=left | | 14.00 | ||||
| 4 | align=left | align=left |  | 14.11 | |||
| 5 | align=left | align=left |  | 14.43 | |||
| 6 | align=left | align=left | | 14.46 | |||
| 7 | align=left | align=left | 14.48 | ||||
| 8 | align=left | align=left | 14.49 |
19 July
Wind: -0.7 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 13.94 | Q | |||
| 2 | align=left | align=left | | 14.02 | Q | ||
| 3 | align=left | align=left | | 14.48 | Q | ||
| 4 | align=left | align=left | 14.51 | Q | |||
| 5 | align=left | align=left |  | 14.52 | |||
| 6 | align=left | align=left | 14.77 | ||||
| 7 | align=left | align=left |  | 14.84 | |||
| 8 | align=left | align=left |  | 15.43 |
Wind: +0.4 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 13.72 | Q | |||
| 2 | align=left | align=left | | 14.18 | Q | ||
| 3 | align=left | align=left | 14.32 | Q | |||
| 4 | align=left | align=left | | 14.34 | Q | ||
| 5 | align=left | align=left | | 14.46 | |||
| 6 | align=left | align=left | | 14.49 | |||
| 7 | align=left | align=left | | 14.68 | |||
| 8 | align=left | align=left | 15.04 |
18 July
Wind: -0.4 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 14.48 | Q | ||
| 2 | align=left | align=left | | 14.55 | Q | ||
| 3 | align=left | align=left | | 14.58 | Q | ||
| 4 | align=left | align=left | 14.61 | Q | |||
| 5 | align=left | align=left |  | 14.66 | |||
| 6 | align=left | align=left |  | 14.82 | |||
| 7 | align=left | align=left |  | 16.19 |
Wind: +1.1 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 14.40 | Q | |||
| 2 | align=left | align=left | | 14.53 | Q | ||
| 3 | align=left | align=left | 14.88 | Q | |||
| 4 | align=left | align=left | | 14.98 | Q | ||
| 5 | align=left | align=left |  | 14.99 |
Wind: -0.5 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 14.22 | Q | ||
| 2 | align=left | align=left | 14.26 | Q | |||
| 3 | align=left | align=left | 14.41 | Q | |||
| 4 | align=left | align=left | | 14.42 | Q | ||
| 5 | align=left | align=left |  | 15.33 | |||
| 6 | align=left | align=left | 15.90 | ||||
| 7 | align=left | align=left | | 16.18 |
Wind: -0.9 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 14.25 | Q | |||
| 2 | align=left | align=left | | 14.41 | Q | ||
| 3 | align=left | align=left | | 14.48 | Q | ||
| 4 | align=left | align=left | | 14.56 | Q | ||
| 5 | align=left | align=left | 14.71 | ||||
| 6 | align=left | align=left | | 14.77 | |||
| 7 | align=left | align=left | 16.24 |
According to an unofficial count, 26 athletes from 18 countries participated in the event.