2015 World Youth Championships in Athletics – Boys' 400 metres

The Boys' 400 metres at the 2015 World Youth Championships in Athletics was held on 15-17 July.

Christopher Taylor of Jamaica won the event. His time of 45.27 seconds was a world age-15 best.

Records
Prior to the competition, the following records were as follows.

Results
Qualification rule: first 3 of each heat (Q) and the next 6 fastest qualified beyond the first round.