Mongolia participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.

Medals awarded to participants of mixed-NOC (combined) teams are represented in italics.

These medals are not counted towards the individual NOC medal tally.

Mongolia qualified a boys' team based on the U18 3x3 National Federation Ranking.

[1] Mongolia qualified one athlete based on its performance at the 2018 Asian Youth Championships.