The mixed relay triathlon was part of the Triathlon at the 2018 Commonwealth Games program.

The competition was held on 7 April 2018 in the Southport Broadwater Parklands.

All times are Australian Eastern Standard Time (UTC+10) Each team consisted of four athletes (two male and two female) and each had to cover a course of 250 metres (0.16 mi) swimming, 7 kilometres (4.3 mi) road bicycling, and 1.5 kilometres (0.93 mi) road running.

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