A major concern during the Covid-19 pandemic has been with the spread of misinformation and conspiracy theories related to the origin of the virus, how serious the risk was, and on the newly developed Covid-19 vaccines. These conspiracies lead to lower compliance with safety measures and reduce vaccination uptake, putting the entire world at risk. Anecdotally, it appears that populists have been instrumental in the spread of Covid-19 conspiracies, and theory would lead us to expect that: we know that populist attitudes are related to conspiratorial thinking among the public; and we know that populist discourse has elements, such as the anti-elitist appeal, that border on conspiracism. However, to date the evidence that populist politicians are more likely to spread conspiracy theories is very limited. We test that with a dataset containing all Facebook posts by every member of parliament in six EU countries plus the UK in 2020 and 2021. We first identify a list of approximately ten thousand websites which engaged with spreading fake news, and then look at what politicians are more likely to share covid-19 conspiracies from those links. Results reveal that right-wing populists were on average more likely to share Covid-19-related conspiracies, but that there are still important variation within and across countries. These results are the first systematic cross-national evidence that populist actors do engage more in spreading conspiracies, and help us understand how they build their appeal in a time of crisis.