The men's 100 metres at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 10 and 11 July.
[1][2][3] Qualification: The first 2 of each heat (Q) and the 6 fastest times (q) qualified Qualification: The first 2 of each heat (Q) and the 2 fastest times (q) qualified Wind: +0.1 m/s According to an unofficial count, 71 athletes from 55 countries participated in the event.