Men
| World records | 200 m individual medley | Ryan Lochte (USA) | 1:54.00 | Shanghai, China | July 28, 2011 |
| 400 m individual medley | Michael Phelps (USA) | 4:03.84 | Beijing, China | August 10, 2008 | |
| 4x100 m medley relay | United States | 3:27.28 | Rome, Italy | August 2, 2009 |
Women
| World records | 200 m individual medley | Ariana Kukors (USA) | 2:06.15 | Rome, Italy | July 27, 2009 |
| 400 m individual medley | Ye Shiwen (CHN) | 4:28.43 | London, U.K. | July 28, 2012 | |
| 4x100 m medley relay | United States | 3:52.05 | London, U.K. | August 4, 2012 |
- A listing of how the World Records have progressed over time can be found here: 100 IM, 200 IM, 400 IM and Medley Relay.
Read more about this topic: Medley Swimming
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