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

The girls' 100 metre butterfly event at the 2018 Summer Youth Olympics took place on 11 and 12 October at the Natatorium in Buenos Aires, Argentina.

Heats
The heats were started on 11 October at 11:05.

Semifinals
The semifinals were started on 11 October at 18:12.

Final
The final was held on 12 October at 18:11.