4x Mixed Relay Triathlon was part of the triathlon at the 2014 Summer Youth Olympics programme. The event consisted of a relay with each athlete performing 250 metres (0.16 mi) of swimming, 7 kilometres (4.3 mi) of cycling, and 1.7 kilometres (1.1 mi) of running. It was held on 21 August 2014 at Xuanwu Lake. The teams were made based on the results of the boys' and girls' triathlon event held of 17–18 August 2014. Each team had two boys and two girls and were split by continent. A total of 16 teams raced in the event.