Swimming at the 2009 World Aquatics Championships – Women's 400 metre individual medley
The heats and finals for the women's 400 m individual medley race at the 2009 World Championships took place in the morning and evening of 2 August at the Foro Italico in Rome, Italy. The order of swimming in the medley is: butterfly, backstroke, breaststroke, freestyle.
|4:29.45||Stephanie Rice||Beijing||10 August 2008|
|4:32.89||Katie Hoff||Melbourne||1 April 2007|
|Katinka Hosszú||Hungary||4:30.31||3||CR, ER|
|4||Hannah Miley||Great Britain||4:32.72||7|
|5||Elizabeth Beisel||United States||4:34.90||5|
|6||Julia Smit||United States||4:35.33||2|