2010 European Athletics Championships – Men's 400 metres

The men's 400 metres at the 2010 European Athletics Championships was held at the Estadi Olímpic Lluís Companys on 27, 28 and 30 July.

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

Semifinals
First 2 in each heat and 2 best performers advance to the Final.