Aims The present research was conducted in 2017-2018 with an aim to determin the relationship of participatory management style with Organizational Citizenship Behavior and organizational commitment of nurses in hospitals affiliated with Mashhad University of Medical Sciences.
Methods & Materials The present research was a descriptive-correlational applied study. The statistical population of the study included all nurses working in hospitals affiliated with Mashhad University of Medical Sciences and it was comprised of 3538 members. A one-step cluster sampling was used in the present research. Using Cochran formula, 347 members of this community were selected as samples. In order to collect data, standard participatory management (Choopani), Organizational Citizenship Behavior (Organ and Konovsky), and organizational commitment (Allen and Meyer) questionnaires were used. Cronbach’s Alpha showed that the values for reliability of the three questionnaire were 0.902, 0.7140 and 0.795, respectively. The validities of the three questionnaires were confirmed by content validity and construct validity. SPSS18 and LISREL software were used to analyze the data.
Findings The findings of the research showed that the relationship between participatory management style and organizational citizenship behavior was positive and significant (P=0.62), and the relationship between participatory management style and organizational commitment was also positive and significant (p=0.48). Considering the value of path coefficient, it was concluded that politeness dimension and respect dimension of organizational citizenship behavior (P=0.65) and emotional commitment dimension (P=0.53) have the most intense relationships with participatory management style. 
Conclusion The final results of the research suggested that participatory management was in a significant positive relationship with all dimensions of citizenship behavior an also, with the three dimensions of organizational commitment. therefore, it is recommended that the managers of treatment and healthcare centers adopt participatory management style.