2001 IAAF World Indoor Championships – Men's 400 metres
The men's 400 metres event  at the 2001 IAAF World Indoor Championships was held on March 9–11. Medalists

Results

Heats
The first two of each heat (Q) and the next 2 fastest (q) qualified for the semifinals. Semifinals
First 3 of each semifinal (Q) qualified directly for the final. Final

References
Results

400
400 metres at the World Athletics Indoor Championships