The 2018 ITU Triathlon Mixed Relay World Championship was the 10th edition of the mixed relay world championships and the 6th to be held in Hamburg, Germany. The race was hosted on 15 July 2018 to coincide with the 2018 ITU World Triathlon Series Hamburg race, and featured 40 men and 40 women representing 20 countries. The race was around the Binnenalster, an artificial lake in central Hamburg. The race followed the standard mixed relay format, where each athlete would swim 300m, cycle 7 km and run 1.7 km before tagging their next teammate to do the same, with the specified gender order of female—male—female—male.