Athletics at the 2010 Commonwealth Games – Men's 400 metres

The Men's 400 metres at the 2010 Commonwealth Games as part of the athletics programme was held at the Jawaharlal Nehru Stadium on Thursday 7 October till Saturday 9 October 2010.

The winning margin was 0.02 seconds equalling the winning margin from the men's 400 metres final at the Manchester games in 2002. As of 2024, these remain the closest finals in the men's 400 metres at these games since the introduction of fully automatic timing.

The top three runners in each of the initial six heats automatically qualified for the second round. The next six fastest runners from across the heats also qualified. Those 24 runners competed in three semi-finals, with the top two runners from each heat qualifying for the final plus the two fastest runners.

Round 1
First 3 in each heat (Q) and 6 best performers (q) advance to the Semifinals.

Semifinals
First 2 in each heat (Q) and 2 best performers (q) advance to the Final.