The Men's 100 metre breaststroke competition at the 2017 Summer Universiade was held on 20 and 21 August 2017.

[1] Prior to the competition, the existing world and Universiade records were as follows.

The heats were held on 20 August at 10:28.

[2] The semifinals were held on 20 August at 19:41.

[3] The final was held on 21 August at 19:34.