The men's high jump event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 21 and 23 July.
| Gold | Mutaz Issa Barshim | |
| Silver | David Smith | |
| Bronze | Naoto Tobe |
23 July
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 2.30 | ||||
| align=left | align=left | | 2.24 | ||||
| align=left | align=left | | 2.21 | ||||
| 4 | align=left | align=left |  | 2.21 | |||
| 5 | align=left | align=left |  | 2.21 | |||
| 6 | align=left | align=left |  | 2.17 | |||
| 7 | align=left | align=left |  | 2.17 | |||
| 7 | align=left | align=left |  | 2.17 | |||
| 7 | align=left | align=left |  | 2.17 | |||
| 10 | align=left | align=left | 2.17 | ||||
| 11 | align=left | align=left |  | 2.13 | |||
| 12 | align=left | align=left |  | 2.13 |
21 July
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 2.17 | q | ||
| 2 | align=left | align=left | | 2.17 | q | ||
| 3 | align=left | align=left | | 2.17 | q | ||
| 4 | align=left | align=left | 2.17 | q | |||
| 5 | align=left | align=left | | 2.14 | q | ||
| 6 | align=left | align=left | | 2.14 | q | ||
| 7 | align=left | align=left |  | 2.14 | |||
| 8 | align=left | align=left |  | 2.14 | |||
| 9 | align=left | align=left |  | 2.14 | |||
| 9 | align=left | align=left | 2.14 | ||||
| 11 | align=left | align=left | 2.10 | ||||
| 11 | align=left | align=left | | 2.10 | |||
| 13 | align=left | align=left | 2.10 | ||||
| 14 | align=left | align=left |  | 2.05 | |||
| 15 | align=left | align=left |  | 2.00 | |||
| 15 | align=left | align=left |  | 2.00 | |||
| align=left | align=left |  | NH |
| Rank | Name | Nationality | Result | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 2.17 | q | ||
| 2 | align=left | align=left | | 2.17 | q | ||
| 2 | align=left | align=left | | 2.17 | q | ||
| 4 | align=left | align=left | | 2.17 | q | ||
| 5 | align=left | align=left | | 2.17 | q | ||
| 6 | align=left | align=left | | 2.14 | q | ||
| 7 | align=left | align=left | 2.14 | ||||
| 8 | align=left | align=left | | 2.10 | |||
| 9 | align=left | align=left | | 2.10 | |||
| 10 | align=left | align=left | 2.10 | ||||
| 11 | align=left | align=left | | 2.10 | |||
| 12 | align=left | align=left | | 2.10 | |||
| 13 | align=left | align=left | | 2.05 | |||
| 14 | align=left | align=left | | 2.05 | |||
| 15 | align=left | align=left | 2.00 | ||||
| 16 | align=left | align=left | | 2.00 | |||
| align=left | align=left | NH |
According to an unofficial count, 34 athletes from 26 countries participated in the event.