Background Rationing of care in nursing is nurses' inability to complete all care activities for patients because of scarcity in time and resource. Literature suggests that rationing of care is closely related to patient safety and quality of care. The phenomena have been defined and studied from varied perspectives and contexts. A systematic review of studies related to the concept was aimed at identifying and synthesizing the finding. Methods The review followed Preferred Reporting Items for Systematic Reviews and Meta‐analysis guidelines, and literature searches were conducted in MEDLINE, CINAHL, PsycInfo, Web of Science and EMBASE databases. Fifty‐seven quantitative studies were included in the review. Findings The review observed that nursing activities addressing the emotional, educational, mobility and hygiene needs of the patients were commonly rationed. Antecedents of rationing included resource inadequacy and organizational work environment. Rationing influenced patient satisfaction, mortality and a number of adverse events and was associated with decreased job satisfaction, increased intention to leave and high turnover among nurses. Discussions This review concludes that rationing in nursing is ubiquitous, embedded in the work environment and poses a threat to the professional health and philosophical base of nursing in addition to having serious implications on patients' safety. Strategies to reframe and reconsider organizational traits, and open discussion with other healthcare stakeholders can reduce rationing of nursing care. The review suggests future researchers adopt different methodological layout to study rationing.