The book "Population Forecasting of Bangladesh using Bayesian Approach" offers a comprehensive analysis of population forecasting for Bangladesh, a country with a growing elderly population. Given the projections that Bangladesh will have a significant share of the global elderly population by 2025, accurate population forecasting is crucial. The work highlights the limitations of traditional methods such as exponential or geometric projection and emphasizes the advantages of the cohort-component method, which considers all aspects of population growth. Additionally, an innovative approach based on Bayesian statistics is presented, integrating formal inference methods. The analysis employs the MCMC technique in conjunction with the WinBUGS software to ensure the accuracy of the forecasts. The book is aimed at professionals and students engaged in the field of population forecasting and statistical methods.