2012 FINA World Swimming Championships (25 m) – Men's 100 metre individual medley

The men's 100 metre individual medley event at the 11th FINA World Swimming Championships (25m) took place 15 – 16 December 2012 at the Sinan Erdem Dome. The final was won by American Ryan Lochte in a time of 51.21. In the semifinals, Lochte broke Peter Mankoč's world record of 50.76 set in 2009 with a time of 50.71.

Records
Prior to this competition, the existing world and championship records were as follows:

The following records were established during the competition:

Final
The final was held at 19:37.