Introduction: Clinical self-efficacy is an individual's belief for doing clinical skills. As much as individuals have higher efficacy in clinical practice, their clinical practice will be better. The aim of the present study was to determine the clinical self-efficacy, its dimensions and related factors in nursing students at Qazvin University of Medical Sciences in 2016.

Methods: In this descriptive-analytical study, 150 nursing students were selected by the census method. Data were collected using the demographic characteristic form and clinical self-efficacy questionnaire. Also, the data were analyzed by descriptive and analytical tests using the SPSS 16 software.

Results: The total mean score of clinical self-efficacy was 106.54 ± 21.14. Assessment of the patients had the highest scores among the dimensions of clinical efficacy (34.42 ± 7). There was a significant correlation between the average scores of the students (r = 0.17, P = 0.02) and studying at higher semesters (P < 0.001) with clinical self-efficacy.

Conclusions: Self-efficacy is one of the important concepts to promote the clinical performance in nursing students. Therefore, it is recommended that to strengthen all aspects of clinical self-efficacy, organized educational programs with a supportive approach be developed.