This study aims to determine the effect of financial knowledge, financial attitudes and locus of control on the investment decisions of investors in the Investment Gallery of Muhammadiyah Ponorogo University. This research uses quantitative methods. The data used was obtained from distributing questionnaires to investors. The population in this study were all investors registered at the Investment Gallery of Muhammadiyah Ponorogo University. The sample in this study was 130 which were obtained using simple random sampling technique using the Arikunto formula. The data analysis method used is Partial Least Square (PLS). From the results of the study it is known that financial knowledge has a positive and significant effect on investment decisions, financial attitude has a positive and significant effect on investment decisions and locus of control has a positive and significant effect on investment decisions.