Behavioral finance has emerged as a critical field challenging the traditional rational actor model of economic decision-making. This research paper investigates how emotions and psychological biases fundamentally influence investment decisions among retail investors. Through a mixed-methods approach combining quantitative survey analysis (n=60 respondents) and qualitative behavioral pattern assessment, this study identifies three primary emotional drivers—fear, overconfidence, and regret—and four major cognitive biases—loss aversion, herding behavior, overconfidence bias, and recency bias—that distort investment choices. The study reveals that 70% of surveyed investors acknowledge emotions significantly affect their investment decisions, with younger investors (18–25 years) showing higher emotional volatility and lower risk management discipline. Key findings demonstrate that investors with higher emotional awareness and experience make more rational decisions, while those subject to strong emotional reactions exhibit patterns of panic selling, overtrading, and herd-following behavior. This research provides empirical evidence that emotional intelligence and systematic investment processes can mitigate behavioral biases, offering practical strategies for both individual investors and financial advisors to build more disciplined, long-term investment approaches. Keywords: Behavioral finance, investor psychology, emotions, cognitive biases, loss aversion, overconfidence, herding behavior, investment decision-making, financial markets