Abstract: This study aims to have investigated the relationship between characteristics of mission statement and organizational performance in the SME Iranian organizations. This research intended to study the clearness of the mission statement, the completeness of the mission statement, the practicality of the mission statement, the reality of the mission statement, the amount of employee’s and manager’s awareness of the mission statement, the amount of the acceptance of the mission statement, the flexibility of the mission statement, paying attention to the stakeholders in the mission statement and the distinctiveness of the mission statement in the SMEs. A conceptual model of an analytical research for Mission in this SMEs is developed from the findings and literature review. This article has been based on interviews and distributing the questionnaire, Data were collected from 176 managers from SMEs. Hypotheses were tested using Pearson correlation analysis and Regression analysis. Test of hypotheses revealed that there is a positive and meaningful correlation between each of the characteristics of the mission statement and organizational performance. As such, among the mentioned characteristics, from the viewpoint of the managers, the flexibility of the mission statement had the most impact on the organizational performance and the perfectness of the mission statement had the least impact on the organizational performance. In conclusion, the evaluation of amount of the execution of the Mission is expected to reveal the effectiveness, efficiency and adaptability of Mission efforts so as to add more value to the overall performance of the SMEs and help them to satisfied customers needs. In this paper, there is little or no empirical evidence investigating the amount of the execution of the Mission in SMEs. This paper rectifies this imbalance by clarifying the significance others factors in Mission.