The success and survival of every institution largely depend on the level of commitment individual employees put at work which translate into better employees’ performance. The organizational culture served as bedrock for enticing employees to increase or decrease their level of commitment and performance at work. When organizational culture is perceived as friendly and encompassing employees perform optimally to achieve organizational goals. The main objective of this study is to examine the impact of organizational culture on employee’s performance in selected public tertiary institutions in Adamawa State: taking into account the mediating effect of employee’s commitment”. The study adopted a descriptive survey research design in which data was collected from 477 sample workforce of the selected public tertiary institutions using structured questionnaires. Data was analyzed using partial least square with the help of Smart PLS 4.6.8. The findings revealed a significant and positive relationship between organizational culture and employee’s performance. It was primarily found out that employee’s commitment positively and significantly mediates the relationship between organizational culture and employee’s performance in selected public tertiary institutions in Adamawa State. The study therefore, concluded that employee commitment serve as a mediator between organizational culture and employee’s performance. The findings of this study are therefore expected to provide insights for stakeholders, policymakers, and managers of public tertiary institutions in Adamawa state as regards to organizational culture and employee’s performance. It was recommended that the management of the institutions should ensure that organizational culture is supportive to employee commitment, which would in turn have a positive effect on employees’ performance.