Mongolia competed at the 2015 World Championships in Athletics in Beijing, China, from 22–30 August 2015.

Results (q – qualified, NM – no mark, SB – season best)

Men Track and road events AthleteEventHeatSemifinalFinalResultRankResultRankResultRank Ser-Od Bat-Ochir Marathoncolspan=4 2:32:0938

Women Track and road events AthleteEventHeatSemifinalFinalResultRankResultRankResultRank Luvsanlkhündegiin Otgonbayar Marathoncolspan=4 DNF Munkhzaya Bayartsogtcolspan=4 2:45:0135

References