The mixed Nacra 15 competition at the 2018 Summer Youth Olympics in Buenos Aires took place between 8–13 October at Club Nautico San Isidro. Thirteen races were held.
Scoring system: low-point system; Legend: BFD – Black flag disqualification; DNF – Did not finish; DSQ – Disqualified; RET – Retired; UFD – "U" flag disqualification; † – Discarded race not counted in the overall result;