2012 World Junior Championships in Athletics – Men's 110 metres hurdles

The men's 110 metres hurdles at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 10–12 July.

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

Heats
Qualification: The first 2 of each heat (Q) and the 8 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, 56 athletes from 42 countries participated in the event. • 🇦🇷 argentina (1)

• 🇦🇺 australia (1)

• 🇦🇹 austria (1)

• undefined (2)

• 🇧🇾 belarus (1)

• 🇧🇷 brazil (1)

• 🇧🇬 bulgaria (1)

• 🇨🇦 canada (2)

• undefined (2)

• 🇨🇳 china (1)

• undefined (1)

• 🇨🇺 cuba (1)

• undefined (1)

• 🇫🇮 finland (2)

• 🇫🇷 france (2)

• 🇩🇪 germany (2)

• 🇭🇰 hong kong (1)

• 🇭🇺 hungary (2)

• undefined (1)

• 🇮🇱 israel (1)

• 🇮🇹 italy (2)

• 🇯🇲 jamaica (2)

• 🇯🇵 japan (2)

• 🇰🇿 kazakhstan (1)

• undefined (1)

• 🇱🇦 lao people's democratic republic (1)

• 🇲🇽 mexico (1)

• 🇳🇦 namibia (1)

• 🇵🇱 poland (2)

• 🇷🇺 russia (1)

• undefined (2)

• undefined (1)

• 🇪🇸 spain (2)

• undefined (1)

• undefined (1)

• 🇹🇭 thailand (1)

• undefined (1)

• 🇹🇳 tunisia (1)

• 🇹🇷 turkey (1)

• undefined (1)

• 🇺🇸 united states (2)

• 🇻🇪 venezuela (1)