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.

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

Qualification: The first 2 of each heat (Q) and the 8 fastest times (q) qualified

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

According to an unofficial count, 56 athletes from 42 countries participated in the event.