Purpose of ReviewThe ability to effectively prepare for and respond to the psychological fallout from large-scale disasters is a core competency of military mental health providers, as well as civilian emergency response teams. Disaster planning should be situation specific and data driven; vague, broad-spectrum planning can contribute to unprepared mental health teams and underserved patient populations. Herein, we review data on mental health sequelae from the twenty-first century pandemics, including SARS-CoV2 (COVID-19), and offer explanations for observed trends, insights regarding anticipated needs, and recommendations for preliminary planning on how to best allocate limited mental health resources.Recent FindingsAnxiety and distress, often attributed to isolation, were the most prominent mental health complaints during previous pandemics and with COVID-19. Additionally, post-traumatic stress was surprisingly common and possibly more enduring than depression, insomnia, and alcohol misuse. Predictions regarding COVID-19’s economic impact suggest that depression and suicide rates may increase over time.SummaryAvailable data suggest that the mental health sequelae of COVID-19 will mirror those of previous pandemics. Clinicians and mental health leaders should focus planning efforts on the negative effects of isolation, particularly anxiety and distress, as well as post-traumatic stress symptoms.