2012 European Athletics Championships – Men's 400 metres

The men's 400 metres at the 2012 European Athletics Championships was held at the Helsinki Olympic Stadium on 27, 28 and 29 June.

Round 1
First 4 in each heat (Q) and 4 best performers (q) advance to the Semifinals.

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