The Men's 50 metre backstroke swimming events for the 2020 Summer Paralympics took place at the Tokyo Aquatics Centre from August 29 to September 3, 2021.
The S1 category is for swimmers who may have tetraplegia, or some form of loss of muscular power in their legs, arms and hands.
The final in this classification took place on 2 September 2021: The S2 category is for swimmers who may have limited function in their hands, trunk, and legs, and mainly rely on their arms to swim.
The final in this classification took place on 29 August 2021: The S4 category is for swimmers who have function in their hands and arms but can't use their trunk or legs to swim, or they have three amputated limbs.
The final in this classification took place on 3 September 2021: The S5 category is for swimmers who have hemiplegia, paraplegia or short stature.