We investigate the impact of a global health crisis on political behavior. Specifically, we assess the impact of Covid-19 incidence rates, and the impact of temporal and spatial proximity to the crisis, on voter turnout in the 2020 Brazilian municipal elections. Methods: We use Ordinary Least Squares and Spatial Durbin Error models to evaluate sub-national variation in municipallevel Covid-19 incidence and voter turnout. We include controls for political, economic, health, and state context. Results: Ceteris paribus, increasing deaths in the month leading up to the election from 0.01 to 1 per 1000 people is associated with a 5 percentage point decrease in turnout; higher cases and deaths earlier in the pandemic are generally associated with higher turnout. Covid-19 incidence rates in nearby municipalities affect local turnout in the same directions. Conclusion: Higher Covid-19 incidence near the time of the election decreases voter turnout, while incidence farther from the election increases voter turnout.Globalization and climate change have increased the frequency and extent of extreme weather, financial and economic crises, and disease outbreaks (Baer and Singer, 2016). These multidimensional crises simultaneously encompass society, politics, and the environment (Gills, 2010), often with profound repercussions for democracy. They can also act as "stress tests," revealing the capacity and willingness of elected officials to respond and the political psychology and behavior of voters. The Covid-19 pandemic-a health and economic crisis-has had profound effects on the material and physical security of citizens, on psychological factors such as anxiety and risk perceptions (Dryhurst et al., 2020), and on public opinion and trust in science and political institutions (Bol et al., 2020;Schraff, 2020;Agley, 2020). The myriad impacts of the pandemic are likely to affect voter turnout and democratic accountability (de Koeijer and Parkinson, 2020;Achen and Bartels, 2017).The dynamics and motivations of political behavior during a crisis are complex. Changes in the perceived costs and benefits of voting can either increase or decrease turnout (Aldrich, 1993), and vote shares can shift as voters punish (Cole, Healy and Werker, 2012) or reward incumbents (Cole, Healy and Werker, 2012;Bechtel and Hainmueller, 2011). While an election offers an opportunity to hold elected officials 2210