Background: Nursing is considered one of the most stressful professions. A high level of occupational stress has been found to reduce the job performance, and the quality of nursing care. But emotional stability increases the capacity to stay calm when exposed to stress. Aim: This study aimed to assess the emotional stability and its relation to job stress and job performance among nurses working at Damanhour Eye Hospital. Research Design: A descriptive explanatory research design was utilised to achieve the aim of this study. Setting: This study was conducted at Damanhour Eye Hospital. Subjects: This study was conducted on 127 nurses. Sample type: A convenience  sample was recruited for this study. Tools of data collection: Data were obtained through four tools: 1) A demographic interview questionnaire; 2) Emotional Stability Scale (ESS); 3) Job Performance Scale (JPS); and 4) Nurses' Occupational Stressor Scale (NOSS). Results: Nearly three-quarters of the studied nurses had an average level of emotional stability; more than two-thirds of the studied nurses had a moderate level of job stress; and nearly half of the studied nurses had an average level of job performance. Conclusion: Based on the present study findings, nearly three-quarters of the studied nurses had an average level of emotional stability, more than two-thirds of them had a moderate level of job stress, and nearly half of the nurses had an average level of job performance. There was a highly statistically significant relationship between the total levels of emotional stability, occupational stress, and job performance of the studied nurses. Recommendations: Educational workshops and periodic training programs should be conducted for all nurses to increase their knowledge and competencies regarding the development of emotional stability to reduce job stress, and enhance job performance.