Background & Aims: Missed nursing care is a common threat to the safety and quality of patient care, and investigating the influential factors in this regard could prevent or minimize this issue. Missed nursing care could lead to patient readmission and extra costs imposed on patients and healthcare organizations. Supervisor support plays a pivotal role in the commitment of nurses to the organization. The behaviors and activities of health supervisors could promote the positive attitude of the subordinates, thereby leading to their moral commitment. Although missed nursing care is considered to be a highly challenging issue for nursing managers, few studies have evaluated perceived care support and the associated challenges. The present study aimed to investigate the correlation between missing nursing care and perceived supervisory support. Materials & Methods: This descriptive-correlatinal study was conducted on 139 nurses employed in the inpatient wards of Imam Reza Hospital in Urmia, Iran during May-March 2019. The participants were selected via census sampling. Data were collected using a questionnaire, the first section of which consisted of demographic data, the second section was the missed care nursing questionnaire, and the third section included the standard tools for the assessment of perceived supervisory support. The missed care questionnaire was designed and psychoanalyzed by Kalish in 2006, and the items are scored based on a five-point Likert scale (Never=0, Always=4). The scale has four domains of review, interventions and personal care, interventions and primary care, and planning. The family supportive supervisor behaviors (FSSB) perceived support questionnaire consists of 14 items and was designed and psychoanalyzed by Hammer in 2009. The questionnaire items are scored based on a five-point Likert scale, with the higher scores indicating higher parental support. The main dimensions of the FSSB are emotional support, instrumental support, and role models. After obtaining the required permit for sampling, the questionnaire was distributed among the nurses working in different shifts and on different days. With their consent, the contact number of the participants was obtained. The questionnaires were collected from the respondents in the same or the next work shift and with proper coordination. The inclusion criteria were having a bachelor's degree (or higher), informed consent to participate in the research, employment in the hospital as a nurse, and minimum work experience of six months. Data analysis was performed in SPSS version 16 using descriptive statistics (mean and standard deviation), Pearson's correlation-coefficient, independent t-test, and the analysis of variance (ANOVA) at the significance level of P˂0.05. Results: The highest mean scores of perceived supervisory support achieved by the nurses were in the items regarding time allocation to listening to the problems of nurses, listening to the problems of nurses about work difficulties and unemployment, creativity in task assignme...