The Men's 100 Individual Medley (or "I.M.") at the 10th FINA World Swimming Championships (25m) was swum 18 – 19 December 2010 in Dubai, United Arab Emirates. On 18 December, 83 individuals swam in the Preliminary heats in the morning, with the top-16 finishers advancing to the Semifinals that evening. The top-8 finishers from Semifinals then advanced to the Final the next evening. At the start of the event, the existing World (WR) and Championship records (CR) were: The following records were established during the competition: