2012 World Junior Championships in Athletics – Women's 800 metres

The women's 800 metres at the 2012 World Junior Championships in Athletics will be held at the Estadi Olímpic Lluís Companys on 10, 11, and 12 July.

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

Heats
Qualification: The first 3 of each heat (Q) and the 6 fastest times (q) qualified

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

Participation
According to an unofficial count, 42 athletes from 30 countries participated in the event. • undefined (1)

• undefined (1)

• 🇧🇾 belarus (1)

• 🇧🇷 brazil (1)

• (2)

• undefined (1)

• 🇪🇹 ethiopia (2)

• 🇫🇮 finland (1)

• (2)

• (2)

• 🇮🇸 iceland (1)

• 🇮🇪 ireland (1)

• (1)

• 🇯🇲 jamaica (2)

• 🇯🇵 japan (2)

• 🇰🇿 kazakhstan (1)

• 🇰🇪 kenya (1)

• 🇲🇦 morocco (2)

• 🇵🇱 poland (1)

• undefined (1)

• 🇷🇴 romania (1)

• 🇷🇸 serbia (1)

• undefined (1)

• undefined (2)

• 🇪🇸 spain (1)

• 🇹🇷 turkey (1)

• 🇺🇬 uganda (2)

• 🇺🇦 ukraine (2)

• undefined (2)

• (2)