The women's 400 metres at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 11, 12, and 13 July. [1] [2] [3]
| Gold | Ashley Spencer |
| Silver | Kadecia Baird |
| Bronze | Erika Rucker |
Prior to the competition [update] , the existing world junior and championship records were as follows.
| World Junior Record | 49.42 | Tokyo, Japan | 27 August 1991 | |
| Championship Record | 50.62 | Plovdiv, Bulgaria | 10 August 1990 | |
| World Junior Leading | 51.02 | Madison, United States | 13 May 2012 | |
| Broken records during the 2012 World Junior Championships in Athletics | ||||
|---|---|---|---|---|
| Championship Record World Junior Leading | 50.50 | Barcelona, Spain | 13 July 2012 | |
Qualification: first 3 of each heat (Q) plus the 6 fastest times (q) qualified
Qualification: first 2 of each heat (Q) plus the 2 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note |
|---|---|---|---|---|---|---|
| 1 | 1 | 6 | Erika Rucker | 52.05 | Q, PB | |
| 2 | 3 | 5 | Ashley Spencer | 52.24 | Q | |
| 3 | 1 | 4 | Kadecia Baird | 52.40 | Q | |
| 4 | 1 | 7 | Justine Palframan | 52.65 | q | |
| 5 | 1 | 5 | Chrisann Gordon | 52.70 | q | |
| 6 | 3 | 9 | Olivia James | 52.71 | Q, SB | |
| 7 | 2 | 4 | Shaunae Miller | 52.75 | Q | |
| 8 | 2 | 6 | Bianca Răzor | 52.87 | Q | |
| 9 | 3 | 4 | Rashan Brown | 52.88 | ||
| 10 | 2 | 7 | Ekaterina Renzhina | 52.97 | ||
| 11 | 3 | 7 | Patrycja Wyciszkiewicz | 53.04 | ||
| 12 | 1 | 9 | Adelina Pastor | 53.28 | SB | |
| 13 | 2 | 5 | Morgan Mitchell | 53.88 | PB | |
| 14 | 1 | 8 | Abbey de la Motte | 53.90 | PB | |
| 15 | 3 | 2 | Ella Räsänen | 54.40 | ||
| 16 | 1 | 2 | Grace Claxton | 54.42 | NJ | |
| 17 | 2 | 9 | Maike Schachtschneider | 54.49 | ||
| 18 | 1 | 3 | Joanna Mills | 54.52 | ||
| 19 | 3 | 8 | Jie Chen | 54.67 | ||
| 20 | 2 | 8 | Bianka Kéri | 54.68 | ||
| 21 | 2 | 2 | Flavia Battaglia | 54.82 | ||
| 22 | 3 | 6 | Alina Galitskaya | 54.98 | ||
| 23 | 2 | 3 | Viktoriya Tkachuk | 55.02 | ||
| 24 | 3 | 3 | Simone Werner | 55.85 |
| Rank | Lane | Name | Nationality | Time | Note |
|---|---|---|---|---|---|
| 6 | Ashley Spencer | 50.50 | CR | ||
| 4 | Kadecia Baird | 51.04 | AJ | ||
| 5 | Erika Rucker | 51.10 | PB | ||
| 4 | 7 | Shaunae Miller | 51.78 | ||
| 5 | 3 | Justine Palframan | 51.87 | NJ | |
| 6 | 8 | Bianca Răzor | 52.20 | SB | |
| 7 | 2 | Chrisann Gordon | 52.31 | SB | |
| 8 | 9 | Olivia James | 52.68 | SB |
According to an unofficial count, 40 athletes from 30 countries participated in the event.