The men's javelin throw at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 12 and 13 July.
Prior to the competition[update], the existing world junior and championship records were as follows.
Qual. rule: qualification standard 72.00 m (Q) or at least best 12 qualified (q)
According to an unofficial count, 46 athletes from 35 countries participated in the event.