1985 IAAF World Indoor Games – Men's 400 metres

The men's 400 metres event at the 1985 IAAF World Indoor Games was held at the Palais Omnisports Paris-Bercy on 18 and 19 January.

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

Semifinals
First 3 of each semifinal (Q) qualified directly for the final.