The men's triple jump event at the 1988 World Junior Championships in Athletics was held in Sudbury, Ontario, Canada, at Laurentian University Stadium on 30 and 31 July.
| Gold | Vladimir Melikhov | |
| Silver | Galin Georgiev | |
| Bronze | Eugene Greene |
31 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | 16.49 (w: +1.4 m/s) | 16.69 (w: +1.6 m/s) | x | x | - | x | 16.69 (w: +1.6 m/s) | |||||
| align=left | align=left | 15.85 (w: +1.9 m/s) | 15.78 w (w: +2.2 m/s) | 16.14 (w: +0.4 m/s) | 15.34 (w: +0.6 m/s) | 15.34 w (w: +2.2 m/s) | 16.18 (w: +1.8 m/s) | 16.18 (w: +1.8 m/s) | |||||
| align=left | align=left | x | 16.07 w (w: +3.0 m/s) | 16.16 (w: +1.2 m/s) | 15.90 (w: +0.5 m/s) | 15.50 (w: +0.4 m/s) | 15.01 (w: +0.5 m/s) | 16.16 (w: +1.2 m/s) | |||||
| 4 | align=left | align=left | 16.12 w (w: +2.8 m/s) | x | 15.51 w (w: +2.3 m/s) | 14.88 (w: +1.1 m/s) | 15.74 (w: +0.5 m/s) | 15.56 (w: +1.3 m/s) | 16.12 w (w: +2.8 m/s) | ||||
| 5 | align=left | align=left |  | x | 16.07 w (w: +2.8 m/s) | x | x | x | 15.52 (w: +0.8 m/s) | 16.07 w (w: +2.8 m/s) | |||
| 6 | align=left | align=left |  | 15.94 (w: +1.5 m/s) | 15.87 (w: +0.6 m/s) | 15.16 (w: +1.4 m/s) | 15.34 (w: -0.3 m/s) | 15.65 (w: -0.6 m/s) | x | 15.94 (w: +1.5 m/s) | |||
| 7 | align=left | align=left | 15.83 (w: +1.7 m/s) | x | x | 15.29 (w: NWI) | 15.63 (w: NWI) | 15.57 (w: +1.3 m/s) | 15.83 (w: +1.7 m/s) | ||||
| 8 | align=left | align=left |  | x | 15.53 w (w: +3.0 m/s) | 15.39 (w: +1.0 m/s) | 13.02 (w: NWI) | x | - | 15.53 w (w: +3.0 m/s) | |||
| 9 | align=left | align=left | 15.48 w (w: +2.1 m/s) | x | 15.45 w (w: +2.5 m/s) | 15.48 w (w: +2.1 m/s) | |||||||
| 10 | align=left | align=left |  | 15.09 (w: +0.2 m/s) | x | 15.24 (w: +0.3 m/s) | 15.24 (w: +0.3 m/s) | ||||||
| align=left | align=left |  | x | x | x | NM | |||||||
| align=left | align=left | | x | x | x | NM | |||||||
30 Jul
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 16.52 w (w: +2.4 m/s) | - | - | 16.52 w (w: +2.4 m/s) | Q | |||
| 2 | align=left | align=left | | 16.00 (w: +1.9 m/s) | - | - | 16.00 (w: +1.9 m/s) | Q | ||
| 3 | align=left | align=left | | 15.91 w (w: +3.7 m/s) | - | - | 15.91 w (w: +3.7 m/s) | Q | ||
| 4 | align=left | align=left | | x | 15.88 w (w: +2.3 m/s) | - | 15.88 w (w: +2.3 m/s) | Q | ||
| 5 | align=left | align=left | x | x | 15.75 (w: +1.5 m/s) | 15.75 (w: +1.5 m/s) | Q | |||
| 6 | align=left | align=left |  | x | 15.55 (w: +1.0 m/s) | 15.26 (w: NWI) | 15.55 (w: +1.0 m/s) | |||
| 7 | align=left | align=left | | 15.14 (w: NWI) | x | 15.53 (w: +0.8 m/s) | 15.53 (w: +0.8 m/s) | |||
| 8 | align=left | align=left | 15.10 (w: +1.8 m/s) | 15.39 w (w: +2.7 m/s) | 15.37 (w: NWI) | 15.39 w (w: +2.7 m/s) | ||||
| 9 | align=left | align=left | 15.16 (w: NWI) | 15.30 (w: +1.4 m/s) | x | 15.30 (w: +1.4 m/s) | ||||
| 10 | align=left | align=left |  | 15.12 w (w: +3.4 m/s) | x | x | 15.12 w (w: +3.4 m/s) | |||
| 11 | align=left | align=left |  | 14.82 (w: +0.9 m/s) | x | x | 14.82 (w: +0.9 m/s) | |||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 16.26 w (w: +3.4 m/s) | - | - | 16.26 w (w: +3.4 m/s) | Q | ||
| 2 | align=left | align=left | | 13.95 (w: NWI) | x | 16.23 w (w: +2.6 m/s) | 16.23 w (w: +2.6 m/s) | Q | ||
| 3 | align=left | align=left | 16.14 w (w: +2.3 m/s) | - | - | 16.14 w (w: +2.3 m/s) | Q | |||
| 4 | align=left | align=left | | x | 16.08 (w: +0.6 m/s) | - | 16.08 (w: +0.6 m/s) | Q | ||
| 5 | align=left | align=left | 16.04 w (w: +3.6 m/s) | - | - | 16.04 w (w: +3.6 m/s) | Q | |||
| 6 | align=left | align=left | 14.33 (w: NWI) | 15.93 w (w: +5.0 m/s) | - | 15.93 w (w: +5.0 m/s) | Q | |||
| 7 | align=left | align=left | 15.48 (w: NWI) | 15.38 (w: NWI) | 15.68 (w: -0.5 m/s) | 15.68 (w: -0.5 m/s) | Q | |||
| 8 | align=left | align=left | | 15.55 w (w: +4.0 m/s) | 15.21 (w: +1.2 m/s) | 15.17 (w: NWI) | 15.55 w (w: +4.0 m/s) | |||
| 9 | align=left | align=left |  | 15.43 w (w: +4.7 m/s) | 15.23 (w: +1.5 m/s) | 15.10 (w: NWI) | 15.43 w (w: +4.7 m/s) | |||
| 10 | align=left | align=left | | x | 14.48 (w: +1.2 m/s) | 15.22 w (w: +2.4 m/s) | 15.22 w (w: +2.4 m/s) | |||
| 11 | align=left | align=left |  | 14.84 w (w: +3.3 m/s) | x | x | 14.84 w (w: +3.3 m/s) | |||
According to an unofficial count, 22 athletes from 14 countries participated in the event.