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, 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.