Background and Objectives: Justice is one of the basic principles of medical ethics which indicates rightful, fair, impartial, and equitable care. The present study aimed to introduce patient favoritism, a phenomenon that undermines justice. Methods: The present qualitative study was conducted based on some data derived from another qualitative study titled “ Investigating the process of achieving justice in nursing care delivery” using content analysis. The data were extracted from semi-structured interviews with 22 participants (i. e., 16 clinical nurses and nurse managers from all over the country and 6 healthcare policymakers). The interviews were in-depth, semi structured, and face-to-face, with open-ended questions. Results: Based on the data, the concept of patient favoritism can be divided into three themes in the healthcare system of Iran. These themes are as follows: 1) types of patient favoritism with three sub-themes of prioritized patients, patients who receive high-quality services, and those who are exempt of the hospital rules and regulations, 2) reasons for accepting patient favoritism with three sub-themes of the lack of trust in the healthcare system, misuse of public services, and scarce medical resources, and 3) reasons for receiving favored patients with four sub-themes of the sense of entitlement among healthcare workers, inability to defy the commands of superiors, inability to refuse the request of colleagues, and a win-win deal. Conclusion: The phenomenon of patient favoritism, irrespective of its type, is a barrier to justice in health care and threatens medical ethics. Accordingly, this issue can seriously harm the healthcare system.