Swimming at the 2018 Summer Youth Olympics – Girls' 100 metre backstroke

The girls' 100 metre backstroke event at the 2018 Summer Youth Olympics took place on 7 and 8 October at the Natatorium in Buenos Aires, Argentina.

Heats
The heats were started on 7 October at 10:48.

Semifinals
The semifinals were started on 7 October at 18:30.

Final
The final was held on 8 October at 19:06.