Cryptocurrency is one of the most significant technological inventions in the modern world, which has attracted much public attention. Cryptocurrencies are considered assets that promise huge profits, so many millennials are interested in making these investments. This study examines millennial investors' behavior, which consists of overconfidence, risk perception, and self-control—Bias on investment decisions in cryptocurrencies. The research design uses a correlational research approach with individual units of analysis. The research sample using the purposive side method, namely millennial investors who invest in cryptocurrency assets, obtained 112 respondents—collecting data through the distribution of questionnaires with data analysis using multiple linear regression analysis. The study's results prove that overconfidence behavior positively affects investment decisions in cryptocurrency assets. Risk Perception has a negative relationship with investment decisions in cryptocurrency assets.