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Abstract The primary focus of this paper is to investigate the influence of science literacy, particularly health literacy, on vaccine-specific conspiracy beliefs, within the broader context of vaccine hesitancy. The authors tested deficit (scientific literacy shapes science attitudes) and contextual models (contextual variables exert direct influence and influence the connection between literacy and science attitudes) in a survey research study (N = 729) in Croatia. The analytical approach included structural equation modeling with vaccination conspiracy beliefs as the outcome variable and health literacy, religiosity, and political identification as predictors. The results showed that lower health literacy and higher religiosity were related to higher vaccination conspiracy beliefs, which was not the case for political identification. In addition, the moderating effect of religiosity on the relationship between health literacy and conspiracy beliefs was confirmed. In contrast, the moderating effect of political identification was not confirmed, thus partially confirming the stronger version of the contextual model. The authors comparatively discuss the results by evoking specific socio-political characteristics of Croatian society as well as the reactions of political and religious organizations to the COVID-19 pandemic.