This project focuses on opinion mining on movie review. Opinion mining provides a set of tools and techniques for extracting and classifying subjective information form the contents. I introduce opinion mining classifiers fundamentals and methods in two approaches; supervised and unsupervised.  This project implements Opinions mining by using Naïve Bayes Classifier and MaxEnt Classifier. I explain Naïve Bayes Classifier and MaxEnt Classifier in detail.  I compare the results of Naïve Bayes Classifier and MaxEnt Classifier. As a result, the accuracy of MaxEnt Classifier was better than Naïve Bayes Classifier.