Swimming at the 2020 Summer Paralympics – Men's 100 metre breaststroke

The Men's 100 metre breaststroke swimming events for the 2020 Summer Paralympics took place at the Tokyo Aquatics Centre from August 26 to September 1, 2021.

The final in this classification took place on 29 August 2021: The SB5 category is for swimmers who have short stature, arm amputations, or some form of coordination problem on one side of their body.

The final in this classification took place on 28 August 2021: The SB7 category is for swimmers who have a single amputation, or restrictive movement in their hip, knee and ankle joints.

The final in this classification took place on 1 September 2021: The SB8 category is for swimmers who have joint restrictions in one leg, or double below-the-knee amputations.

The final in this classification took place on 26 August 2021: The SB11 category is for swimmers who have severe visual impairments and have very low or no light perception, such as blindness, they are required to wear blackened goggles to compete.