Introduction: Managers’ self-efficacy and belief to fulfill their managerial performance is considered as an indicator for quality of nursing services, it also determine their needs to participate in continuing education programs and promote awareness.

 Aim: This study was done for assessing charge nurse s' managerial self-efficacy in teaching hospitals in Arak in 2012.

 Method: This study was descriptive - cross. All of the nurses who worked in teaching hospitals in Arak city were samples that 199of them took part in this study. A self-administered questionnaire " assessment charge nurse s' managerial self-efficacy" was designed in the five areas of planning, organization, staffing, directing / leading and controlling / monitoring that measures charge nurses' confidence about their ability to perform managerial functions. Validity and reliability of the questionnaire were measured respectively with content validity and test - retest reliability (α=0.76). Data with descriptive statistics were analyzed using SPSS software.

 Results: Data analysis showed that (88.1%) of charge nurses were female the mean of work experience were (6.45±5.10) years and (44.2%) of them had more than (30) year's old. The majority (62.3 % ) of them determined their self-efficacy in moderate level. The highest their efficacy was in the control domain (3.73 ± 0.47) and the lowest their efficacy was in staffing domain (3.32 ± 0.57).

 Conclusion: Although in this study there was no weak self-efficacy yet the current situation is far from the ideal charge nurse self-efficacy . So, nurse managers could be improving charge nurses' performance with proper supportive planning and motivational mechanisms.