This paper sets out to explore the relationship between terrorism and institutional trust. Trust in institutions can be seen as a cornerstone of democracy as it relates to citizens willingness to participatein the democratic process, and uphold the norms of democratic society. Terrorism, with its intent to influence society through the spread of fear, puts democratic resilience at the forefront. Institutions within democratic societies are often believed to be shaped in such a way that they can withstand shocking events, but a number of studies show that trust in institutions can wane under such circumstances, undermining the democratic system. This study conducts a cross-sectional time-series regression analysis as to assess the impacts of the frequency and the severity of terror attacks upon three separate institutions in European democracies, namely; the country’s parliament, its legal system, and its police. Overall, the study finds a statistically significant correlation in the long-term between the severity of terror attacks and the three institutions, but the time-series analysis shows no significant effects of terror attacks upon institutional trust.