The boys' 50 metre backstroke 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 10:38.

[2] The semifinals were started on 9 October at 19:08.

[3] The final was held on 10 October at 18:34.

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