Dissertation (MBA)The performance of organizations is directly impacted by organizational culture and strategy implementation. Values and beliefs are roots of organizations culture which end up on developing strategies and its implementations through identify weakness and its opportunity which may lead to identifying the value of the organization. The study aimed at assessing the impact of the culture of the organization on strategy implementation in non-government organizations in Tanzania. This paperwork was guided by the following objectives: 1) to determine how organizations norms and beliefs affect strategy implementation in organizations, 2) to find out the influence of communication model and style in the strategy implementation in organizations, to examine the contribution of organization principles on strategy implementations in organizations and analyzing the extent to which organization practices influence strategy implementations in organizations. A descriptive research design was employed using 50 respondents with questionnaire as data collecting tool. The study found that organizations norms and beliefs have a significant influence on strategy implementations (β = 0.335; p =.015). The communication model and style are significantly shown to influence strategy implementation in organizations (β = 3.045; p =.001). The organization principles have a significant contribution to strategy implementations in organizations (β = 3.020; p =.010). Organization daily practices have a significant contribution to strategy implementations in organizations (β = 2.020; p =.000). It is recommended that organizations and firms stakeholders should appreciate the importance of organization culture in strategy implementation and in the general performance of their firms, administrative management has to monitor and evaluate strategy progress in regular basis and provide timely feedback in order to take corrective measures. Managers have to be involved in the decision of the implementation and satisfactory communication between all parties is important for fruitful implementation as effective communication lead to better performance.