The mixed relay triathlon at the 2020 Summer Olympics took place at the Odaiba Marine Park in Tokyo on 31 July 2021.

The mixed team event featured teams of four (two men and two women). Each athlete performed a triathlon of swim, cycle, and a run in a relay format.

Kristian Blummenfelt and Flora Duffy, gold medallists in men's and women's individual events, were unable to participate since Norway and Bermuda failed to qualify four athletes, while Austria and South Africa were forced to scratch as they were unable to field a team due to athletes being injured during individual events. Great Britain, France, Germany and the United States were considered strong medal contenders.

Alex Yee, silver medallist of the men's individual event, brought Great Britain home for the gold. Morgan Pearson and Vincent Luis anchored the silver and bronze for the United States and France. Mexico's Irving Pérez finishes the race as the last athlete while Russia's Igor Polyanski tested positive for doping and receives 3-year suspension in October 2021, jeopardizing the country's rank in the event.

Results Rank Nation Triathletes Jess LearmonthJonny BrownleeGeorgia Taylor-BrownAlex Yee16:1339:5723:141:23:41 __ Katie ZaferesKevin McDowellTaylor KnibbMorgan Pearson16:2839:2623:311:23:55 +0:14 Léonie PériaultDorian ConinxCassandre BeaugrandVincent Luis16:3539:5123:211:24:04 +0:234Rachel KlamerMarco van der StelMaya KingmaJorik van Egdom16:2739:4423:501:24:34 +0:535Claire MichelMarten Van RielValérie BarthelemyJelle Geens16:2539:5723:511:24:36 +0:556Laura LindemannJonas SchomburgAnabel KnollJustus Nieschlag16:2639:5323:591:24:40 +0:597Jolanda AnnenAndrea SalvisbergNicola SpirigMax Studer16:3640:1724:031:25:27 +1:468Verena SteinhauserGianluca PozzattiAlice BettoDelian Stateff16:3340:4624:381:26:23 +2:429Ashleigh GentleMatthew HauserEmma JeffcoatJacob Birtwhistle16:2741:1624:191:26:27 +2:4610Anna GodoyFernando AlarzaMiriam CasillasMario Mola16:2941:1024:241:26:31 +2:5011Zsanett BragmayerBence BicsákZsófia KovácsTamás Tóth16:4341:1124:141:26:43 +3:0212Ainsley ThorpeTayler ReidNicole van der KaayHayden Wilde16:4740:3924:561:26:53 +3:1213Yuko TakahashiKenji NenerNiina KishimotoMakoto Odakura16:3840:4825:101:27:02 +3:2114Amélie KretzMatthew SharpeJoanna BrownAlexis Lepage16:4040:3625:231:27:21 +3:4015Cecilia PérezCrisanto GrajalesClaudia RivasIrving Pérez16:3841:3225:591:28:53 +5:12 Julia HauserAlois KnablLisa PertererLukas Hollaus Alexandra RazarenovaDmitry PolyanskiAnastasia GorbunovaIgor Polyanski16:2341:1125:021:27:13 +3:32

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