Abstract: This study’s main objective was to determine the effects of strategic planning activities on organizational growth. Issues had been raised by employees that the planning process tended to be inflexible and rigid since it operated in changing environment and poor adaptation to changing environment usually affected organization adversely. They perceived strategic planning process being unrealistic separated with actions which hindered growth, thus strategies not linked with actions. The Researcher in the study therefore sought to analyze the effects of strategic planning on organization growth. The specific objectives of the study was to establish the effect of setting objectives on organization growth ,to assess the effect of budgetary allocations on organization growth, to determine the effect of organization structure on organization growth and lastly to analyze the effect of performance review on organization growth. Descriptive research design was used which included questionnaires to be distributed and filled with various top managers, heads of department, middle level managers and general staff members of KEMRI. Target population in this research was Kenya Medical and Research Institute Management. The target population was divided into various management groups including Heads of departments, middle level managers and general staff members. Stratified random sampling method was used. The target population was two hundred employees. Stratified sampling method was used to draw the Sample size of 50 employees and data analyzed by use of Spss.