Consumer animosity, as one of the limiting factors in the globalization of the markets, and its effects on purchasing decisions, is one of the most important issues in the field of marketing and consumer behavior which has been the subject of few research studies. This study aims to study the effects of consumer animosity on purchase decisions. This study is an applied one according to the purpose and it is a descriptive survey according to the method. The population of this study was 1277 of MS students in business management at Islamic Azad University of Kermanshah. The sample of the study was 297 based on Morgan’s table. The sampling procedure was simple-random sampling and a researcher made questionnaire was utilized to collect the data. The statistical analyses were run by SPSS and AMOS. The results of the study reveal that general animosity has a direct, significant effect on purchase decisions; economical animosity has an indirect, significant effect on purchase decisions with complete mediation of Purchase Involvement and ethnic animosity has both direct and indirect significant effects on Purchase decisions with partial mediation of Purchase Involvement.