Background and aims: Professional socialization is a process in which nurses compose values, attitudes and acquired knowledge from educational situation with organizational condition and adjust with them. This process is affected by individual organizational and situational factors. So, the aim of this study was to investigate regarding influencing factors to professional socialization of clinical nurses. Methods: This was a cross sectional analytical study. 300 and 200 nurses working in Tehran and Shahrekord teaching hospitals were selected by convenience sampling, respectively on 2013. Data were collected by a valid and reliable questionnaire made by researcher in 2 parts; demographic data and professional socialization and its domain. Data were analyzed using SPSS and descriptive statistics, independent t- test and Chi square test. Results: Results showed there was a significant relationship among professional socialization influencing factors and sex and occupational location (P=0.01). Also, There was a significant relationship among domains of professional socialization and sex, professional commitment (P=0.013) and belongingness (P=0.44). There was significance between occupational location and professional autonomy (P=0.016) and competency (P=0.051) domains of professional socialization. Whereas there was no significant relationship between other influencing factors such as marital status (P=0.707), age (P=0.650), training location (P=0.551), role model (P=0.453) and etc and professional socialization. Conclusion: It seems feminine framework of nursing profession is still an influencing factor of professional socialization. Moreover, working in larger cities provides more opportunity for nursing practice and clinical experiences
