While numerous studies have examined how the COVID-19 pandemic has affected health care systems, supply chains, and economies, we do not understand how the pandemic has impacted the security of democratic and authoritarian states from a global standpoint. Thus, this study examines how COVID-19 has affected the security of democratic and authoritarian regimes. In conducting a historical, qualitative review of the security effects of the pandemic, we find that COVID-19 significantly affected domestic and international security for democratic and authoritarian states in both similar and varied ways. Additionally, the manner in which states responded to the pandemic was often conditioned by their regime type and by the nature of the governing leadership during the pandemic. These findings have important implications in considering how COVID-19 affected the security of democratic and authoritarian states, how regime type shapes government responses to infectious disease outbreaks, and how democratic and authoritarian states may respond to future pandemics.