Larsen udgjorde, sammen med [[Morten Nielsen (roer)|Morten Nielsen]], den danske [[toer uden styrmand]] ved [[Sommer-OL 2008|OL 2008]] i [[Beijing]].<ref>{{cite news|url=https://www.sports-reference.com/olympics/athletes/la/thomas-larsen-2.html|title=Sportsreference.com: Thomas Larsen|accessdate=2021-05-20|archive-date=15. december 2012|archive-url=https://web.archive.org/web/20121215030826/http://www.sports-reference.com/olympics/athletes/la/thomas-larsen-2.html|url-status=dead}} {{en sprog}}</ref> Danskerne sluttede på en samlet 10. plads ud af 14 deltagende både i konkurrencen.<ref>{{cite news|url=http://www.sports-reference.com/olympics/summer/2008/ROW/mens-coxless-pairs.html|title=Sportsreference.com: Rowing at the 2008 Beijing Summer Games: Men's Coxless Pairs|accessdate=2021-05-20|archive-date=20. juni 2009|archive-url=https://web.archive.org/web/20090620025602/http://www.sports-reference.com/olympics/summer/2008/ROW/mens-coxless-pairs.html|url-status=dead}} {{en sprog}}</ref>
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