The men's 100 metre breaststroke event at the 11th FINA World Swimming Championships (25m) took place 12 – 13 December 2012 at the Sinan Erdem Dome.

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

No new records were set during this competition.

[1] [2] The final was held at 20:11.

[3]