Athletics at the 2009 Summer Universiade – Men's 400 metres

The men's 400 metres event at the 2009 Summer Universiade was held on 7–9 July.

Heats
Qualification: First 2 of each heat (Q) and the next 8 fastest (q) qualified for the semifinals.

Semifinals
Qualification: First 2 of each semifinal (Q) and the next 2 fastest (q) qualified for the finals.