The women's 100 metres at the 2012 World Junior Championships in Athletics will be held at the Estadi Olímpic Lluís Companys on 10 and 11 July.[1]
Reigning champion Jodie Williams was eligible to defend her 2010 title, but did not compete.
| Gold | Anthonique Strachan | |
| Silver | Nimet Karakus Turkey | |
| Bronze | Tamiris de Liz Brazil |
, the existing world junior and championship records were as follows.
| World Junior Record | 10.88 | Dresden, Germany | 1 July 1977 | ||
| Championship Record | 11.12 | Santiago, Chile | 18 October 2000 | ||
| World Junior Leading | 11.22 | Nassau, Bahamas | 23 March 2012 | ||
| Broken records during the 2012 World Junior Championships in Athletics | |||||
|---|---|---|---|---|---|
| World Junior Leading | 11.20 | Barcelona, Spain | 11 July 2012 | ||
Qualification: The first 3 of each heat (Q) and the 3 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 6 | 11.56 | Q | |||
| 1 | 5 | 5 | 11.56 | Q | |||
| 3 | 1 | 4 | 11.57 | Q | |||
| 3 | 5 | 8 | 11.57 | Q, SB | |||
| 5 | 3 | 3 | 11.59 | Q | |||
| 5 | 7 | 2 | 11.59 | Q | |||
| 7 | 3 | 6 | 11.63 | Q | |||
| 8 | 6 | 4 | 11.64 | Q | |||
| 9 | 1 | 6 | 11.70 | Q | |||
| 10 | 7 | 8 | 11.72 | Q | |||
| 11 | 7 | 7 | 11.75 | Q | |||
| 12 | 5 | 7 | 11.76 | Q | |||
| 12 | 6 | 2 | 11.76 | Q | |||
| 14 | 2 | 9 | 11.78 | Q | |||
| 14 | 4 | 5 | 11.78 | Q | |||
| 16 | 4 | 6 | 11.80 | Q | |||
| 16 | 6 | 7 | 11.80 | Q | |||
| 18 | 3 | 2 | 11.88 | Q | |||
| 19 | 4 | 7 | 11.94 | Q | |||
| 20 | 4 | 8 | 11.96 | q, PB | |||
| 21 | 1 | 5 | Carla Williams | 11.97 | Q | ||
| 22 | 6 | 5 | 11.97 | q | |||
| 23 | 7 | 4 | 11.98 | q | |||
| 24 | 2 | 8 | 12.00 | Q | |||
| 24 | 3 | 7 | 12.00 | ||||
| 24 | 7 | 5 | 12.00 | ||||
| 27 | 4 | 3 | 12.03 | ||||
| 28 | 2 | 3 | 12.05 | ||||
| 28 | 3 | 4 | 12.05 | ||||
| 30 | 1 | 8 | 12.06 | ||||
| 30 | 7 | 3 | 12.06 | SB | |||
| 32 | 6 | 8 | 12.08 | ||||
| 33 | 3 | 5 | 12.11 | ||||
| 34 | 5 | 2 | 12.20 | ||||
| 35 | 1 | 7 | 12.21 | ||||
| 35 | 2 | 2 | 12.21 | ||||
| 35 | 5 | 6 | 12.21 | ||||
| 38 | 6 | 6 | 12.28 | ||||
| 39 | 3 | 8 | 12.33 | PB | |||
| 40 | 5 | 4 | 12.75 | SB | |||
| 41 | 2 | 5 | 13.05 | PB | |||
| 42 | 5 | 3 | 13.07 | ||||
| 43 | 2 | 7 | 13.13 | PB | |||
| 44 | 1 | 2 | 13.18 | SB | |||
| 45 | 1 | 3 | 13.19 | ||||
| 4 | 2 | ||||||
| 6 | 3 | ||||||
| 2 | 4 | ||||||
| 4 | 4 | ||||||
| 7 | 6 |
Qualification: The first 2 of each heat (Q) and the 2 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|---|
| 1 | 3 | 7 | 11.42 | Q, PB | |||
| 2 | 3 | 5 | 11.47 | Q, PB | |||
| 3 | 3 | 4 | 11.49 | q | |||
| 4 | 1 | 5 | 11.58 | Q | |||
| 5 | 1 | 6 | 11.68 | Q | |||
| 6 | 2 | 7 | 11.68 | Q | |||
| 7 | 1 | 7 | 11.68 | q | |||
| 8 | 3 | 6 | 11.73 | ||||
| 9 | 1 | 2 | 11.76 | ||||
| 10 | 2 | 4 | 11.77 | Q | |||
| 11 | 2 | 6 | 11.77 | ||||
| 12 | 3 | 3 | 11.81 | ||||
| 13 | 3 | 8 | 11.86 | ||||
| 14 | 3 | 6 | 11.87 | ||||
| 15 | 1 | 4 | 11.88 | ||||
| 16 | 1 | 8 | 11.91 | ||||
| 17 | 1 | 9 | 11.94 | ||||
| 18 | 2 | 8 | 11.99 | ||||
| 19 | 3 | 7 | 11.99 | ||||
| 20 | 2 | 9 | 12.09 | ||||
| 21 | 1 | 3 | 12.19 | ||||
| 22 | 2 | 3 | 12.19 | ||||
| 23 | 2 | 5 | 12.24 | ||||
| 24 | 2 | 2 | 12.31 |
Wind: +1.7 m/s
| Rank | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 6 | 11.20 | WJL | ||||
| 7 | 11.36 | |||||
| 4 | 11.45 | |||||
| 4 | 8 | 11.46 | PB | |||
| 5 | 2 | 11.52 | ||||
| 6 | 3 | 11.54 | ||||
| 7 | 9 | 11.58 | ||||
| 8 | 5 | 11.59 |
According to an unofficial count, 47 athletes from 35 countries participated in the event.