The women's discus throw event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 20 and 22 July.
| Gold | Yaime Pérez | |
| Silver | Erin Pendleton | |
| Bronze | Yuliya Kurylo |
22 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | 48.05 | x | 56.01 | 49.04 | 52.23 | 50.77 | 56.01 | ||||
| align=left | align=left | | 53.57 | 53.22 | x | 53.63 | 54.15 | 54.96 | 54.96 | ||||
| align=left | align=left | | 48.31 | x | 52.19 | 53.96 | 52.02 | 53.75 | 53.96 | ||||
| 4 | align=left | align=left |  | 50.99 | 53.16 | 52.19 | 52.74 | 52.55 | 53.77 | 53.77 | |||
| 5 | align=left | align=left | 51.62 | 52.75 | x | x | 49.38 | 52.03 | 52.75 | ||||
| 6 | align=left | align=left |  | 48.85 | 50.25 | x | 51.23 | 49.77 | 52.65 | 52.65 | |||
| 7 | align=left | align=left | 51.31 | 49.74 | x | 41.33 | 51.17 | 48.26 | 51.31 | ||||
| 8 | align=left | align=left | | 45.83 | 50.13 | 47.02 | 47.96 | x | x | 50.13 | |||
| 9 | align=left | align=left |  | 49.46 | 48.79 | x | 49.46 | ||||||
| 10 | align=left | align=left |  | 47.88 | x | 43.50 | 47.88 | ||||||
| 11 | align=left | align=left | 45.52 | 44.76 | x | 45.52 | |||||||
| align=left | align=left |  | x | x | x | NM | |||||||
20 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 53.91 | - | - | 53.91 | Q | ||
| 2 | align=left | align=left | | 38.41 | 47.60 | 52.75 | 52.75 | q | ||
| 3 | align=left | align=left | | x | 50.58 | 52.61 | 52.61 | q | ||
| 4 | align=left | align=left | x | 50.15 | 50.36 | 50.36 | q | |||
| 5 | align=left | align=left | 49.98 | x | 48.74 | 49.98 | q | |||
| 6 | align=left | align=left | | 49.37 | 49.09 | 47.39 | 49.37 | q | ||
| 7 | align=left | align=left | | 48.99 | 47.71 | 48.11 | 48.99 | |||
| 8 | align=left | align=left | | 48.91 | x | 46.53 | 48.91 | |||
| 9 | align=left | align=left | 47.54 | 47.66 | x | 47.66 | ||||
| 10 | align=left | align=left | | 46.71 | x | x | 46.71 | |||
| 11 | align=left | align=left | 46.29 | 44.38 | 45.94 | 46.29 | ||||
| 12 | align=left | align=left |  | 38.94 | x | 43.85 | 43.85 | |||
| 13 | align=left | align=left |  | x | 41.98 | x | 41.98 | |||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | 51.83 | 51.52 | 51.26 | 51.83 | q | |||
| 2 | align=left | align=left | | 48.93 | 51.74 | 48.92 | 51.74 | q | ||
| 3 | align=left | align=left | | x | 51.19 | x | 51.19 | q | ||
| 4 | align=left | align=left | | x | x | 50.14 | 50.14 | q | ||
| 5 | align=left | align=left | | 49.98 | x | x | 49.98 | q | ||
| 6 | align=left | align=left | | x | 49.60 | x | 49.60 | q | ||
| 7 | align=left | align=left | | 42.36 | 48.36 | 48.55 | 48.55 | |||
| 8 | align=left | align=left | 47.68 | 45.49 | 46.31 | 47.68 | ||||
| 9 | align=left | align=left |  | x | x | 46.56 | 46.56 | |||
| 10 | align=left | align=left |  | x | 46.47 | 46.26 | 46.47 | |||
| 11 | align=left | align=left | 45.13 | x | 46.32 | 46.32 | ||||
| 12 | align=left | align=left |  | 43.11 | 44.51 | 45.68 | 45.68 | |||
| 13 | align=left | align=left |  | 44.87 | x | x | 44.87 | |||
| 14 | align=left | align=left | | x | 43.97 | x | 43.97 | |||
According to an unofficial count, 27 athletes from 20 countries participated in the event.