Background Nurses experienced intense ethical and moral challenges during the COVID-19 pandemic. Our 2020 qualitative parent study of frontline nurses’ experiences during the COVID-19 pandemic identified ethics as a cross-cutting theme with six subthemes: moral dilemmas, moral uncertainty, moral distress, moral injury, moral outrage, and moral courage. We re-analyzed ethics-related findings in light of refined definitions of ethics concepts. Research aim To analyze frontline U.S. nurses’ experiences of ethics during the COVID-19 pandemic. Research design Qualitative analysis using a directed content (...) methodology. Participants and research context The study included 43 nurses from three major metropolitan academic medical centers and one community hospital in the northeastern, mid-Atlantic, midwestern, and western United States. Ethical considerations Participant privacy and data confidentiality were addressed. Findings Moral dilemmas arose from many situations, most frequently related to balancing safety and patient care. Moral uncertainty commonly arose from lacking health information or evidence about options. Moral distress occurred when nurses knew the right thing to do, but were prevented from doing so, including with end-of-life issues. Moral injury (accompanied by suffering, shame, or guilt) occurred after doing, seeing, or experiencing wrongdoing, often involving authority figures. Nurses expressed moral outrage at events and people within and outside healthcare. Despite difficult ethical situations, some nurses exemplified moral courage, sometimes by resisting policies they perceived as preventing compassionate care, guided by thinking about what was best for patients. Discussion This content analysis of ethics-related subthemes revealed conceptual characteristics and clarified distinctions with corresponding exemplars. Conceptual clarity may inform responses and interventions to address ethical quandaries in nursing practice. Conclusions Ethics education in nursing must address the moral dilemmas of pandemics, disasters, and other crises. Nurses need time and resources to heal from trying to provide the best care when no ideal option was available. (shrink)