The girls' 100 metre backstroke event in swimming at the 2014 Summer Youth Olympics took place on 17–18 August at the Nanjing Olympic Sports Centre in Nanjing, China.

[1][2][3] The heats were held at 10:42.

[1] The semifinals were held at 18:30.

[2] The swim-off was held at 00:09.

[4] The final was held at 19:06.