Purpose of the present study is to recognize how internal marketing affects organizational commitment. In this research we have used a questionnaire with thirty questions in order to study a one hundred sample of hotel managers and administrators in Isfahan province. In this regard, a model has been designed to show the effect of internal marketing on organizational commitment based on research literature which is tested by means of LISREL software. According to the obtaine results of the questionnaire's data analysis, it has been determined that internal marketing affects organizational commitment directly and indirectly through market orientation. It means that factors of internal marketing influence market orientation directly and then market orientation affectsorganizational commitment. Effects of these factors are significant on organizational commitment directly. Amount of goodness indexes (AGFI= 0.96, GFI= 0.99) shows suitability of the model.