Nowadays the concept of Organizational Citizenship Behavior (OCB) has attracted managers and researcher’s attention. Considering such behaviors that has not been much emphasized one way to increase organizational effectiveness. On the other hand, outstanding organizational performance can not be obtained merely from ordinary staff efforts. One of the reasons underling successes in large organizations is the fact that their staff performance is beyond their formal tasks. By the Meaning of that they show Organizational citizenship behavior (OCB). present research aimed to Impact of Organizational Citizenship Behavior on Organizational Commitment of Employees in the hotel industry in five star hotels of east azerbaijan including: El-goli pars and Shahriar hotels has been done in the summer of 2016. The data required for this research has gathered by questionnaire with Simple random sampling method through five stars hotels employees of Tabriz City. This research, in terms of purpose is functional and based on data collection, is descriptive survey. Also, It has been used structural equation modeling through the SMART PLS software to analyze data. tatistical population of this research has considered all employees of the five stars Hotels Tabriz City. Due to the limited statistical population of the research, from Cochran formula is used in order to determine the sample size that number is obtained 164. Provided results showing that Organizational Citizenship Behavior (OCB) and every one of its dimensions on Organizational Commitment of Employees have a positive and significant impact. and also it was shown that variable Altruism has the largest is path coefficient and its impact on Organizational Commitment of Employees is higher than other variables.