The Men's 100 metre backstroke S2 event at the 2016 Paralympic Games took place on 9 September 2016, at the Olympic Aquatics Stadium.

Two heats were held.

The swimmers with the eight fastest times advanced to the final.

9:30 9 September 2016:[1] 9:36 9 September 2016:[1] 17:40 9 September 2016:[2]