The Covid-19 pandemic was accompanied by a massive increase of the supply and demand for pandemic-related information. Similarly, conspiracy theories about the origins and functions of the Covid-19 virus flourished during the early stages of the pandemic. The present study draws on a nationally representative sample of the German population aged 18+ (N = 1,207) to investigate factors that are associated with people’s susceptibility to believe in such theories. We draw on research from sociology, political science, and communication to predict that factors related to relative deprivation, political radicalism, and the consumption of alternative news on websites, video platforms, Social Network Sites, and messenger services are associated with an increased belief in Covid-19 conspiracy theories. The data largely supports our assumptions. Additionally, we show that the strength of belief in Covid-19 conspiracy theories is associated with reduced vaccination intentions, which suggests detrimental real-world health consequences of such a belief.