The women's discus throw event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 13 and 14 July.
| Gold | Ma Xuejun | |
| Silver | Darya Pishchalnikova | |
| Bronze | Nadine Müller |
14 July
| Rank | Name | Nationality | Attempts | Result | Notes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||||||
| align=left | align=left | | 57.85 | 55.75 | x | 56.78 | 53.43 | 55.31 | 57.85 | ||||
| align=left | align=left | | 54.39 | x | x | 55.52 | x | 57.37 | 57.37 | ||||
| align=left | align=left | 50.55 | 57.06 | 56.96 | 53.36 | 54.82 | 57.13 | 57.13 | |||||
| 4 | align=left | align=left | | 54.48 | 54.94 | 56.61 | 56.03 | 54.18 | 56.07 | 56.61 | |||
| 5 | align=left | align=left | | 46.53 | 49.48 | x | x | 45.50 | 51.86 | 51.86 | |||
| 6 | align=left | align=left |  | 45.92 | 50.34 | x | 50.56 | 49.52 | 46.14 | 50.56 | |||
| 7 | align=left | align=left |  | 46.70 | x | 48.77 | x | x | 45.86 | 48.77 | |||
| 8 | align=left | align=left |  | 43.48 | 46.64 | 47.67 | x | 48.53 | x | 48.53 | |||
| 9 | align=left | align=left |  | 47.61 | x | 46.25 | 47.61 | ||||||
| 10 | align=left | align=left | 43.81 | 46.49 | 44.22 | 46.49 | |||||||
| 11 | align=left | align=left |  | 45.87 | 45.06 | 44.54 | 45.87 | ||||||
| align=left | align=left |  | x | x | x | NM | |||||||
13 July
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 55.96 | - | - | 55.96 | Q | ||
| 2 | align=left | align=left | | 54.11 | - | - | 54.11 | Q | ||
| 3 | align=left | align=left | 53.51 | - | - | 53.51 | Q | |||
| 4 | align=left | align=left | | x | 47.87 | 50.34 | 50.34 | q | ||
| 5 | align=left | align=left | | 44.56 | 49.43 | x | 49.43 | q | ||
| 6 | align=left | align=left | | 39.35 | 45.60 | 48.93 | 48.93 | q | ||
| 7 | align=left | align=left | | 44.80 | 48.01 | 41.98 | 48.01 | q | ||
| 8 | align=left | align=left | | 47.49 | 41.23 | x | 47.49 | q | ||
| 9 | align=left | align=left | | 46.47 | 41.06 | x | 46.47 | |||
| 10 | align=left | align=left | 44.23 | 46.42 | x | 46.42 | ||||
| 11 | align=left | align=left | x | 46.06 | 44.13 | 46.06 | ||||
| 12 | align=left | align=left |  | x | 45.82 | 44.43 | 45.82 | |||
| 13 | align=left | align=left | 45.44 | x | 44.81 | 45.44 | ||||
| 14 | align=left | align=left |  | 42.16 | 42.82 | 45.13 | 45.13 | |||
| 15 | align=left | align=left |  | 44.88 | x | 44.86 | 44.88 | |||
| Rank | Name | Nationality | Attempts | Result | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||||||
| 1 | align=left | align=left | | 53.82 | - | - | 53.82 | Q | ||
| 2 | align=left | align=left | | 50.76 | 50.20 | 50.39 | 50.76 | q | ||
| 3 | align=left | align=left | | 49.84 | 50.38 | 46.47 | 50.38 | q | ||
| 4 | align=left | align=left | 45.90 | x | 46.77 | 46.77 | q | |||
| 5 | align=left | align=left | | 46.59 | x | 46.60 | 46.60 | |||
| 6 | align=left | align=left | x | x | 46.04 | 46.04 | ||||
| 7 | align=left | align=left | | 34.28 | 45.59 | x | 45.59 | |||
| 8 | align=left | align=left | x | x | 45.22 | 45.22 | ||||
| 9 | align=left | align=left | | 45.01 | 37.03 | x | 45.01 | |||
| 10 | align=left | align=left | 43.86 | 41.91 | 44.85 | 44.85 | ||||
| 11 | align=left | align=left | 37.97 | 43.62 | 42.12 | 43.62 | ||||
| 12 | align=left | align=left | | x | x | 43.49 | 43.49 | |||
| 13 | align=left | align=left | 41.51 | 40.39 | x | 41.51 | ||||
| 14 | align=left | align=left |  | x | 41.42 | 41.06 | 41.42 | |||
| 15 | align=left | align=left | | 39.29 | 22.55 | x | 39.29 | |||
According to an unofficial count, 30 athletes from 19 countries participated in the event.