W With the banking competition in the banking industry, has created a highly competitive condition whether for local or foreign banks. PT. Bank Mandiri is a company which operates in a banking operation. In order to compete and obtain a market share in the competition with other companies, thus, PT. Bank Mandiri (PERSERO) Tbk should create a proper benchmark effort. And therefore, OT. Bank Mandiri should improve its organizational culture in order to perform properly in the competition arena and also to be able to improve the company\'s performance.According to Cameron and Quinn (1999), organizational culture is divided into 4 categories : Clan, adhocracy, market and hierarchy cultures. The objective of this research is to identify the most dominant company\'s culture, in the present time and in the future by using questionnaire which was adapted from The Competing Values Framework by Cemeron and Quinn (1999), to analyze the company\'s performance, analyzing the company\'s perfonnance and the organizational culture and providing suggestions of improvement for the company in order to shape preferred company\'s culture in the future and also expected improve the company\'s performance.Data collecting about the organizational culture and company\'s performance, was implemented and distributed to four departments, which are : Board Protocol Administration and Support, Corporate Communications, Unit Performance Policies and Procedure and Investor Relation departments. The conclusion of this research is, the organizational culture of Board Protocol Administration and Support department is dominated by Clan culture with the mean value of 3.95, and the future expected of Board Protocol Administration and Support department is dominated by hierarchy culture with the mean value of4.37. While for the organizational culture of Corporate Communication department is dominated by Clan culture with the mean value of 3.94, and the future expected of Corporate Communication department is dominated by hierarchy culture with the mean value of 4.35. And for the organizational culture of Unit Perfonnance Policies and Procedures department is dominated by Clan culture with the mean value of 3.57, and the future expected of Corporate Communication department is dominated by hierarchy culture with the mean value of 4.56. While for the organizational culture of Investor Relations department is dominated by Clan culture with the mean value of 3.89, and the future expected of Investor Relations department is dominated by hierarchy culture with the mean value of 4.38. And the performance rate of the Board Protocol Administration and Support have a mean value of 4.48, and the perfonnance rate of the Corporate Communication have a mean value of 3.22, the performance rate of the Unit Perfonnance Policies and procedures have a mean value of 3.42, and the performance rate of the Investor Relations have a mean value of 4.21.And the suggestion was suggested in order to shape a better organizationa l culture in the future is, the management should motivate its employees in order to improve their quality.