The boys' 50 metre freestyle event at the 2018 Summer Youth Olympics took place on 9 and 10 October at the Natatorium in Buenos Aires, Argentina.

[1] The heats were started on 9 October at 10:58.

[2] The semifinals were started on 9 October at 18:23.

[3] The swim-off was held on 9 October at 19:53.

[4] The final was held on 10 October at 18:00.