The men's 4 x 400 metres relay event at the 2003 IAAF World Indoor Championships was held on March 15–16.
| width=200 valign=top | Leroy Colquhoun Danny McFarlane Michael Blackwood Davian Clarke Kemel Thompson | width=200 valign=top | Jamie Baulch Timothy Benjamin Cori Henry Daniel Caines Mark Hylton | width=200 valign=top | Rafał Wieruszewski Grzegorz Zajączkowski Marcin Marciniszyn Marek Plawgo Artur Gąsiewski |
* Runners who participated in the heats only and received medals.
Note: The United States (James Davis, Jerome Young, Milton Campbell, Tyree Washington) originally won the gold medal in 3:04.09, but were disqualified after Young admitted to the use of banned substances in 2004.
Qualification: First 2 teams of each heat (Q) plus the next 2 fastest (q) advance to the final.
| Rank | Heat | Nation | Athletes | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | Q, Doping | |||||
| 1 | 1 | 3:06.46 | Q | |||
| 2 | 1 | 3:06.60 | q, SB | |||
| 3 | 2 | 3:08.71 | Q | |||
| 4 | 2 | 3:16.10 | Q | |||
| 2 | ||||||
| 2 | ||||||
| 1 |
| Rank | Nation | Competitors | Time | Notes | |
|---|---|---|---|---|---|
| James Davis, Jerome Young, Milton Campbell, Tyree Washington | Doping | ||||
| Leroy Colquhoun, Danny McFarlane, Michael Blackwood, Davian Clarke | 3:04.21 | NR | |||
| Jamie Baulch, Timothy Benjamin, Cori Henry, Daniel Caines | 3:06.12 | SB | |||
| Rafał Wieruszewski, Grzegorz Zajączkowski, Marcin Marciniszyn, Marek Plawgo | 3:06.61 | SB | |||
| Oleg Mishukov, Aleksandr Usov, Andrey Rudnitskiy, Dmitriy Bogdanov |