1971 European Athletics Indoor Championships – Men's 400 metres

The men's 400 metres event at the 1971 European Athletics Indoor Championships was held on 13 and 14 March in Sofia.

Heats
Held on 13 March

First 2 from each heat (Q) qualified directly for the semifinals.

Semifinals
Held on 13 March

First 2 from each heat (Q) qualified directly for the final.

Final
Held on 14 March