Background Intensive care nurses frequently encounter ethical issues with potentially severe consequences for nurses, patients, and next of kin. Therefore, ethical issues in intensive care units (ICU) should be recognized and managed. Research objectives To analyze ethical issues reported by intensive care nurses and how reported issues were managed within the organization using register data from the HaiPro critical incident reporting system (CIRS), and to explore the suitability of this system for reporting and managing ethical issues. Research design This was (...) a retrospective descriptive register study. CIRS reports on ethical issues in adult ICUs ( n = 12) in one hospital district in Finland over 25 months (2019–2021) were analyzed through inductive content analysis and descriptive quantification. The CIRS’s suitability for reporting and managing ethical issues was evaluated through a strengths, weaknesses, opportunities, and threats (SWOT) analysis. Ethical considerations The study was approved by the University Ethics Committee, and permission to conduct the research was granted before data collection within the organization. Results CIRS reports on ethical issues ( n = 35) made by nurses were found in seven of the 12 ICUs. The CIRS managers of these units managed these reports. The ethical issues described by the nurses were divided into four main categories: nature, situational information, consequences, and contributing factors. Management of reported ethical issues was divided into three main categories: preventive actions proposed by nurses, proposals for actions by CIRS managers, and actions taken by CIRS managers. Conclusions Systematic register data broadly describe ethical issues and their management, indicating that the CIRS could be suitable for reporting and managing ethical issues, thereby enabling the monitoring and development of ethical quality at the unit and organizational levels. (shrink)