The young generation of Muslims in East Java has experienced significant growth in participation in capital market investment, but their investment decisions are often influenced by psychological factors such as investor sentiment, education through social media, and herding behavior. This study aims to analyze the influence of investor sentiment, stock education through social media, and herding behavior on investment decisions of young Muslim investors in East Java. A quantitative approach with a descriptive method was used in this study, with data collected through questionnaires to 400 respondents. Data analysis using multiple linear regression showed that investor sentiment has a significant influence on investment decisions. In addition, stock education through social media has a significant positive impact, indicating that social media plays an important role in improving the quality of investment decision-making. Herding behavior was also found to have a significant influence, indicating that trends and majority decisions influence the investment choices of the younger generation. The results of this study highlight the importance of psychological and social factors in investment decisionmaking and support the relevance of social media-based financial education as a tool to help young investors make more rational and informed decisions. Furthermore, future researchers are encouraged to explore the role of cultural and regional differences in shaping investment behaviors or to use a mixed-methods approach to gain deeper insights into the psychological dynamics behind these factors.