This study investigates the determinants of unwanted fertility in Bangladesh and examines the dominance of each of these factors over others. This study is based on 2011 BDHS data and logistic Regression Technique has been applied for analyses. Result shows that about 17 percent women reported their last birth was unwanted and 83 percent of them married before reaching age 18. The most striking finding of this study is that, along with the unmet need, marriage at younger age, religion, low schooling years of women, and husband’s desire for more children supersede sex preference and these factors influenced to have far higher unwanted births than their respective counterparts. Surprisingly child loss experience has become statistically insignificant even before introducing any control effect, which implies that the fear of child loss has become insignificant to influence Bangladeshi mothers to have unwanted births.