The 4 × 400 metre relay at the 2005 World Championships in Athletics was held at the Helsinki Olympic Stadium on August 13 and August 14.
Andrew Rock Derrick Brew Darold Williamson Jeremy Wariner Miles Smith* LaShawn Merritt* Nathaniel McKinney Avard Moncur Andrae Williams Chris Brown Sanjay Ayre Brandon Simpson Lansford Spence Davian Clarke From the initial two heats the first three teams in each plus two fastest losers progressed through to the final.
All times shown are in seconds.