The men's 100m breaststroke SB12 event at the 2012 Summer Paralympics took place at the London Aquatics Centre on 8 September. There were two heats; the swimmers with the seven fastest times advanced to the final, while because of tied times in the heats the eighth final place was decided by a swim-off.
Results
Heats
Competed from 10:08. Qualification swim-off at 12.11.