2012 World Junior Championships in Athletics – Women's 100 metres

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.

Reigning champion Jodie Williams was eligible to defend her 2010 title, but did not compete.

Prior to the competition^[update], the existing world junior and championship records were as follows.

Qualification: The first 3 of each heat (Q) and the 3 fastest times (q) qualified

Qualification: The first 2 of each heat (Q) and the 2 fastest times (q) qualified

Wind: +1.7 m/s

According to an unofficial count, 47 athletes from 35 countries participated in the event.