The girls' 100 metre breaststroke event in swimming at the 2014 Summer Youth Olympics took place on 19 and 20 August at the Nanjing Olympic Sports Centre in Nanjing, China.

[1][2][3] The heats were held at 10:15.

[1] The semifinals were held at 18:45.

[2] The final was held at 18:14.

[3]