The men's hammer throw at the 2010 World Junior Championships in Athletics was held at the Moncton 2010 Stadium on 23 & 25 July. The final was won by American Conor McCullough. A six-kilogram ball was used throughout the competition.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
Conor McCullough | Ákos Hudi | Alaa El-Din El-Ashry |
Prior to the competition, the existing world junior and championship records were as follows.
| Name | Nationality | Distance | Location | Date | |||
|---|---|---|---|---|---|---|---|
| World junior record | Javier Cienfuegos |  Spain | 82.97 | Madrid | June 17, 2009 | ||
| Championship record | align=left | 78.42 | August 28, 2006 |
The following records were established during the competition:
25 July
| Rank | Athlete | Nationality | 1 | 2 | 3 | 4 | 5 | 6 | Result | Notes | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 77.59 | 80.79 | 80.18 | 78.05 | 80.69 | 80.79 | (CR), (NJR) | |||||
| 78.37 | 74.15 | 77.28 | 76.56 | 75.33 | 78.37 | ||||||
| 76.38 | 76.66 | 74.70 | 75.23 | 76.54 | 76.05 | 76.66 | (PB) | ||||
| 4 | 74.43 | 68.56 | 69.05 | 72.36 | 74.43 | (PB) | |||||
| 5 | 71.16 | 74.41 | 70.85 | 74.41 | |||||||
| 6 | 72.41 | 73.23 | 71.99 | 73.23 | (PB) | ||||||
| 7 | 70.22 | 68.45 | 69.40 | 70.18 | 69.02 | 71.51 | 71.51 | ||||
| 8 | 67.03 | 67.22 | 64.07 | 67.22 | |||||||
| 9 | 67.22 | 67.22 | |||||||||
| 10 | 67.20 | 67.20 | |||||||||
| 11 | 67.02 | 66.46 | 67.02 | ||||||||
| 12 | 66.02 | 66.54 | 66.54 |
Key: CR = Championship record, NJR = National junior record, PB = Personal best
23 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 76.05 | - | - | 76.05 | Q | ||
| 2 | align=left | align=left |  | x | 71.55 | - | 71.55 | Q | ||
| 3 | align=left | align=left | | 60.24 | x | x | 70.89 | q | ||
| 4 | align=left | align=left | 68.13 | x | 67.34 | 68.13 | q | |||
| 5 | align=left | align=left |  | x | 64.54 | 67.50 | 67.50 | q | ||
| 6 | align=left | align=left |  | 63.82 | 66.57 | 65.51 | 66.57 | |||
| 7 | align=left | align=left |  | 63.78 | x | 66.56 | 66.56 | |||
| 8 | align=left | align=left | x | x | 66.12 | 66.12 | ||||
| 9 | align=left | align=left | | 62.36 | 65.71 | 64.42 | 65.71 | |||
| 10 | align=left | align=left | | 65.54 | 65.38 | 61.80 | 65.54 | |||
| 11 | align=left | align=left |  | 60.80 | 63.71 | 64.99 | 64.99 | |||
| 12 | align=left | align=left | x | 63.98 | 64.75 | 64.75 | ||||
| 13 | align=left | align=left |  | 64.49 | 63.35 | 60.24 | 64.49 | |||
| 14 | align=left | align=left | 62.98 | x | 64.36 | 64.36 | ||||
| 15 | align=left | align=left |  | - | 62.72 | x | 62.72 | |||
| 16 | align=left | align=left | 60.49 | 60.18 | x | 60.49 | ||||
| 17 | align=left | align=left | x | x | 54.12 | 54.12 | ||||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 76.62 | - | - | 76.62 | Q | ||
| 2 | align=left | align=left | | 73.23 | - | - | 73.23 | Q | ||
| 3 | align=left | align=left |  | 68.33 | 72.35 | - | 72.35 | Q | ||
| 4 | align=left | align=left |  | 69.01 | 69.25 | 70.41 | 70.41 | q | ||
| 5 | align=left | align=left | | x | 68.52 | 67.29 | 68.52 | q | ||
| 6 | align=left | align=left | | 67.46 | x | x | 67.46 | q | ||
| 7 | align=left | align=left | 66.82 | x | 63.97 | 66.82 | q | |||
| 8 | align=left | align=left |  | x | x | 66.32 | 66.32 | |||
| 9 | align=left | align=left |  | 62.06 | 62.03 | 65.35 | 65.35 | |||
| 10 | align=left | align=left | | 63.76 | x | 63.10 | 63.76 | |||
| 11 | align=left | align=left |  | x | 61.95 | x | 61.95 | |||
| 12 | align=left | align=left | 61.52 | 58.65 | x | 61.52 | ||||
| 13 | align=left | align=left |  | 70.17 | 70.89 | 69.95 | 60.24 | |||
| 14 | align=left | align=left |  | x | x | 58.91 | 58.91 | |||
| 15 | align=left | align=left |  | x | x | 54.51 | 54.51 | |||
| align=left | align=left |  | x | x | x | NM | ||||
| align=left | align=left | x | x | x | NM | |||||
According to an unofficial count, 34 athletes from 27 countries participated in the event.