This study aimed to determine the relationship between self-efficacy and the level of nomophobia (the fear of being detached from a smartphone) in nurses. This was a descriptive correlative study with a cross-sectional design, where 113 respondents were selected using quota sampling techniques. Data collection was through the Nomophobia Questionnaire and General Self-Efficacy Scale. The study was conducted from June 6 until July 10, 2020, at Hospital X in Bandung, Indonesia. Analysis of the data was through univariate analysis (frequency distribution) and bivariate analysis (Chi-square and Spearman’s correlation test). The results showed that most of the respondents were female (66.4%), and ages ranged between 26 - 56 years old with a mean of 37 years old. The minimum and maximum length of work were 1 and 34 years, respectively. The study showed a significant relationship between the cost of using a smartphone and the level of nomophobia. It also showed a relationship between self-efficacy and the level of nomophobia among nurses from X hospital in Bandung (p < 0.05). Generally, nurses with lower self-efficacy showed a higher degree of nomophobia. These results may be used in developing clear regulations regarding restricting smartphone usage in hospitals and formulating work strategies. This would improve and maintain the nurses’ self-efficacy as an effort to increase the quality of nursing care services as well as patient satisfaction and safety in the hospital. Keywords: self-efficacy, nomophobia, nurse, smartphone

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