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.
Yuliya Pechonkina Olesya Krasnomovets Natalya Antyukh Svetlana Pospelova Shericka Williams Novlene Williams Ronetta Smith Lorraine Fenton Lee McConnell Donna Fraser Nicola Sanders Christine Ohuruogu 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.