2010 FINA World Swimming Championships (25 m) – Men's 100 metre breaststroke
The Men's 100 Breaststroke at the 10th FINA World Swimming Championships 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 and Championship records were:
The following records were established during the competition:
| Date | Round | Name | Nation | Time | WR | CR |
| 15 December 2010 | Heats | Fabio Scozzoli | | 57.60 | | CR |
| 15 December 2010 | Semifinals | Mihail Alexandrov | | 57.18 | | CR |
| 16 December 2010 | Final | Cameron van der Burgh | | 56.80 | | CR |
Results
Heats
Semifinals
Semifinal 1
| Rank | Lane | Name | Time | Notes |
| 1 | 4 | | 58.34 | Q |
| 2 | 2 | | 58.37 | Swim-off |
| 3 | 3 | | 58.46 | |
| 4 | 5 | | 58.48 | |
| 5 | 1 | | 58.58 | |
| 6 | 6 | | 58.61 | |
| 7 | 8 | | 58.72 | |
| 8 | 7 | | 59.21 | |
Semifinal 2
| Rank | Lane | Name | Time | Notes |
| 1 | 5 | | 57.18 | Q, CR |
| 2 | 2 | | 57.19 | Q |
| 2 | 7 | | 57.19 | Q |
| 4 | 4 | | 57.35 | Q |
| 5 | 3 | | 57.84 | Q |
| 6 | 6 | | 57.97 | Q |
| 7 | 8 | | 58.37 | Swim-off |
| 8 | 1 | | 58.85 | |
Semifinals Swim-off
| Rank | Lane | Name | Time | Notes |
| 1 | 4 | | 58.45 | Q |
| 2 | 5 | | 58.71 | |
Final
