This study discusses “Role of Planning and Forecasting in achieving Managerial Effectiveness in Adamawa State University, Mubi”. The problem of the study looks at how budget and forecast results may not focus on accurate or timely information, thus offering little predictive value which limits the organisations ability to respond confidently to changing market conditions and increases the possibility of poor strategic decision making. The research design used for this study is non-experimental design method with specification in descriptive research design. The total population of the study is eight hundred and twenty four (824) which comprises of two hundred and thirty two Academic Staff (232) and five hundred and ninety two (592) non academic Staff of different carders, the sample size was determine at 269 using Yaro Yemani formula. The study was analyzed using descriptive statistics. The finding revealed that strategy roles of planning includes focus on improving forecast accuracy, it enables organisation to react quickly to conditions and alter long range plan. Also the finding revealed that planning and forecasting enhances the value of financial planning information used for strategic decision-making. The study therefore, recommends that there is need for management of ADSU to embrace the use of strategy planning in order to be able to forecast accuracy, to enable the institution to react quickly to conditions and alter long range plan, which can enhance the value of financial planning information to attain go strategic decision-making.