Introduction: Dynamic organizations expect their employees to
behave beyond their defined roles behaviors that employees
promote their performance. Since organizational citizenship
behavior nurses effect on quality of nursing care so, assessing
factors that influence their organizational citizenship behavior would be increased quality of nursing care.

Aim: This main purpose of this study was to assessing the
relationship between lifestyle and organizational citizenship
behavior the clinical nurses with emphasis on intermediate role of organizational commitment.

Method: This study was a descriptive-survey that was done in North Khorasan public hospitals in 2013. In this study, cluster
sampling was used with proportional allocation and finally, 420
nurses were selected randomly. They answered to standardized
questionnaires with Likert scale Organization commitment Allen& Myer (1990), Lifestyle Katler (2000), and citizenship organizational behavior Oregan (2000). The Cronbach’s alpha was used to determine
reliability that was obtained as follows: 82.6%,.85.8% and 87.4%. Finally, data was analyzed by use Spearman and Path Analyze tests through SPSS18 and Lisrel 8.72 soft wares.

Results: There are a significant correlation between the lifestyle
factors activity (β=28%) interests (β=40%), opinion (β=36%),
property population (β=49%), and­ organizational­ commitment­
factors ­affective commitment (β=47%), continuous commitment (β=28%), normative commitment (β=44%) with citizenship
organizational behavior of the nurses. The direct effect nurses’ life style on their citizenship organizational behavior is more than its
effect with organizational commitment as a mediator (p<0.000).

Conclusion: In order to findings suggested that nurse managers planning for changing factors that effect on nurses’ life style and their organizational commitment for improving nurses’ citizenship behavior.