The aims of this research is to provide empirical evidence of the influence of trust, service quality and information quality on purchasing decisions on the Olx site in Semarang. The population in this study is unknown. The research sample consists of 96 respondents using purposive sampling techniques, data collection methods through questionnaires and data analysis using SPSS version 25 which includes tests: validity, reliability, normality, multicollinearity, heteroscedasticity, t & F test and coefficient of determination (R²). The results of this research showed that: trust, service quality and information quality had a positive and significant effect on purchasing decisions on the Olx site in Semarang. The coefficient of determination (adjusted R2) = 38.3 percent means that purchasing decisions on the Olx site in Semarang can be explained by variations in the variables of trust, service quality and information quality while the rest = 61.7 percent is influenced by other variables not examined.
                        
                        
                        
                        
                            
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