The Men's 100 Breaststroke at the 10th FINA World Swimming Championships (25m) was swum 15 – 16 December 2010 in Dubai, United Arab Emirates. On 15 December, 85 individuals swam in the Preliminary heats in the morning, with the top-16 finishers advancing to swim again in the Semifinals that night. The top-8 finishers from the Semifinals then advanced to swim in 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: