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Introduction: Emotional intelligence (EI) is increasingly acknowledged as a component that may influence nurses' job performance (JP), particularly in high-stress contexts. This study examined the relationship between emotional intelligence and job performance among critical care nurses at King Salman Specialist Hospital in Hail, Saudi Arabia. Design/Methods: The cross-sectional study included 50 registered nurses working in the critical care unit, following the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) checklist. Data were gathered using validated tools. The data were collected between October and December 2024. Point-biserial correlation (rpb), one-way ANOVA and simple linear regression were employed. Results: This study found that neither gender (r_pb = 0.095, p = 0.514) nor age group (F = 0.945; p = 0.423) had a significant impact on EI or JP scores. Meanwhile, the linear regression model was highly significant (F [1, 48] = 45.829; p < 0.001), indicating that EI is a robust predictor of performance in this cohort. Contrary to common assumptions, a significant negative (inverse) relationship was identified. For every one-unit increase in EI, job performance decreased by 0.541 units (β = -0.699; t = -6.77; p < 0.001). Conclusions: This study confirms that EI serves as a notable inverse predictor of JP of critical care nurses. This shows that there could be high levels of emotional labor in the demanding clinical environment, which could hinder technical performance. This finding, irrespective of age or gender, defies the 'more is better' generalization of EI in the healthcare industry. Therefore, it is essential that there be available supportive mechanisms in the workplace to assist nurses with high EI in managing their emotional involvement with clinical work. This should be done to avoid a compromise in job performance.