A Cob-Douglas stochastic frontier production function was estimated to determine the technical efficiency of Boro rice production in Bangladesh. Technical inefficiency effect model was also estimated simultaneously with stochastic frontiers to identify factors, which influence efficiency. The coefficients of fertilizer, irrigation and human labour were found to be significantly positive in the stochastic frontier function, which meant with increase of fertilizer, irrigation and human labour the production of Boro rice will be increased. The coefficient of extension contact was negative and significant in the inefficiency effect model in Phulpur upazIla. This indicates that inefficiency decreases with the increase in extension contact. The mean technical efficiency was 92 percent. There appeared 8 percent inefficiency, which means that the farmers increase their production 8 percent without changing the input.