Conspiracy Theories (CTs) are a global phenomenon, but some societies are better equipped than others to resist them. This article discusses the characteristics of the China-related COVID-19 CTs in the Brazilian Facebook, based on 28,312 posts published from January 2020 to June 2021. We argue that, in Brazil, the spread of CTs was facilitated by a widespread political and knowledge institutions’ legitimacy crisis. The rise of the extremist politician Jair Bolsonaro to the Presidency provides evidence in this regard. In consequence, the boundaries between fringe and mainstream politics become porous. This article discusses which agents disseminate China-related COVID-19 CTs, and which topics receive more attention. We found a significant presence of actors belonging to mainstream politics and the media among the CTs’ main disseminators. Additionally, the CTs circulating in the Brazilian social media environment reproduce concerns about China’s growing presence in the global arena, which originate elsewhere. Still, they add a specific emphasis on the Communist threat. We sustain that this emphasis relates as much to Brazil’s internal politics as to China itself. (AU)