This study aims to determine the significant impact of overconfidence bias, Loss Aversion Bias, Cognitive Bias, Optimistic Bias and Bounded Rationality on stock market investment patterns in Lucknow city. The study includes three types of market investment such as Mutual funds, Debt market and Share Market. The study is based on primary data collection from various brokerage firms from individual investors. The findings of this paper shows the significant impact of investor’s psychological biases on investment pattern. This study is helpful for individual investors for develop awareness about the biases which affect their investment decision. It is also helpful for brokerage houses, financial advisors, brokers, financial institutions to take a better investment decision while finding the presence of psychological biases in individual investors which helps to maintain rationality in investment choices in order to avoid risk and uncertainties in future investments.