Sri Lanka competed at the 2017 World Championships in Athletics in London, United Kingdom, from 4–13 August 2017.

Results (q – qualified, NM – no mark, SB – season best) Men Track and road events AthleteEventFinalResultRankAnuradha CoorayMarathon–

Field events AthleteEventQualificationFinalDistancePositionDistancePosition Waruna Lakshan Javelin throw73.1631colspan=2

Women Track and road events AthleteEventHeatSemifinalFinalResultRankResultRankResultRankNimali Liyanarachchi800 metres2:08.4943colspan=4 Hiruni Kesara WijavaratneMarathoncolspan=4 –

References