The men's 110 metres hurdles event at the 1988 World Junior Championships in Athletics was held in Sudbury, Ontario, Canada, at Laurentian University Stadium on 29 and 30 July. 106.7 cm (3'6) (senior implement) hurdles were used.
| Gold | Reynaldo Quintero | |
| Silver | Steve Brown | |
| Bronze | Elbert Ellis |
30 July
Wind: +3.0 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 13.71 w | ||||
| align=left | align=left | | 13.73 w | ||||
| align=left | align=left | | 13.78 w | ||||
| 4 | align=left | align=left | 13.82 w | ||||
| 5 | align=left | align=left | 14.02 w | ||||
| 6 | align=left | align=left |  | 14.03 w | |||
| 7 | align=left | align=left |  | 14.08 w | |||
| 8 | align=left | align=left |  | 14.19 w |
30 July
Wind: +2.4 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 13.91 w | Q | ||
| 2 | align=left | align=left | | 13.92 w | Q | ||
| 3 | align=left | align=left | | 13.97 w | Q | ||
| 4 | align=left | align=left | | 14.03 w | q | ||
| 5 | align=left | align=left | 14.11 w | ||||
| 6 | align=left | align=left |  | 14.17 w | |||
| 7 | align=left | align=left | 14.18 w | ||||
| 8 | align=left | align=left | 14.99 w |
Wind: +1.6 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 13.91 | Q | ||
| 2 | align=left | align=left | | 13.95 | Q | ||
| 3 | align=left | align=left | 13.97 | Q | |||
| 4 | align=left | align=left | 14.04 | q | |||
| 5 | align=left | align=left |  | 14.40 | |||
| 6 | align=left | align=left |  | 14.53 | |||
| 7 | align=left | align=left | 14.56 | ||||
| 8 | align=left | align=left | | 14.66 |
29 July
Wind: +4.4 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 14.07 w | Q | ||
| 2 | align=left | align=left | | 14.13 w | Q | ||
| 3 | align=left | align=left | | 14.29 w | Q | ||
| 4 | align=left | align=left | 14.48 w | q | |||
| 5 | align=left | align=left | 14.49 w | q | |||
| 6 | align=left | align=left | 14.61 w |
Wind: +2.5 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 13.98 w | Q | ||
| 2 | align=left | align=left | 14.01 w | Q | |||
| 3 | align=left | align=left | | 14.09 w | Q | ||
| 4 | align=left | align=left | | 14.44 w | q | ||
| 5 | align=left | align=left |  | 14.57 w | |||
| 6 | align=left | align=left |  | 15.06 w | |||
| 7 | align=left | align=left |  | 15.09 w |
Wind: +1.8 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 14.02 | Q | ||
| 2 | align=left | align=left | 14.03 | Q | |||
| 3 | align=left | align=left | 14.31 | Q | |||
| 4 | align=left | align=left | | 14.41 | q | ||
| 5 | align=left | align=left |  | 14.53 | |||
| 6 | align=left | align=left | 14.69 |
Wind: +2.6 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 14.12 w | Q | |||
| 2 | align=left | align=left | | 14.20 w | Q | ||
| 3 | align=left | align=left | | 14.53 w | Q | ||
| 4 | align=left | align=left |  | 14.65 w | |||
| 5 | align=left | align=left |  | 15.27 w | |||
| 6 | align=left | align=left |  | 15.79 w |
According to an unofficial count, 25 athletes from 20 countries participated in the event.