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.

Records
, the existing world junior and championship records were as follows.

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

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

Final
Wind: +1.7 m/s

Participation
According to an unofficial count, 47 athletes from 35 countries participated in the event. • 🇦🇩 andorra (1)

• 🇦🇺 australia (2)

• 🇦🇹 austria (1)

• undefined (2)

• 🇧🇷 brazil (2)

• 🇨🇦 canada (2)

• 🇨🇻 cape verde (1)

• undefined (1)

• 🇨🇳 china (2)

• 🇨🇿 czech republic (1)

• 🇩🇴 dominican republic (1)

• 🇩🇪 germany (2)

• 🇬🇭 ghana (1)

• 🇬🇾 guyana (1)

• undefined (1)

• 🇮🇶 iraq (1)

• 🇮🇹 italy (2)

• 🇯🇲 jamaica (2)

• 🇰🇿 kazakhstan (1)

• undefined (1)

• 🇲🇰 macedonia (1)

• 🇲🇽 mexico (1)

• 🇳🇷 nauru (1)

• undefined (1)

• 🇵🇱 poland (1)

• 🇷🇴 romania (1)

• undefined (1)

• 🇸🇲 san marino (1)

• undefined (2)

• 🇪🇸 spain (1)

• undefined (2)

• 🇹🇷 turkey (1)

• undefined (2)

• 🇺🇸 united states (2)

• undefined (1)