This study aims to analyze the effect of the Fraud Triangle, which consists of pressure, opportunity and rationalization, on Fraud Prevention in startups. This study uses a sample of employees who work at Indonesian startups. The independent variables in this study are pressure, opportunity and rationalization. Fraud Prevention as measured by a culture of honesty, fraud risk assessment, and appropriate oversight process act as dependent variables in this study. Finally, the control variable is internal accounting control. In total, there are 4 hypotheses to be tested in this study. Analysis of the data taken from the use of SMART PLS. The results of this study indicate that pressure and rationalization have a significant effect on fraud prevention using the structural equation modeling (SEM).