This study aims to analyze the effect of service quality and product quality on Word of Mouth with purchasing decisions as an intervening variable on MSK Wings products. The subjects in this study were students of Muhammadiyah Yogyakarta University who had at least once purchased MSK Wings products This research was conducted with a total sample of 130 respondents. The sampling technique uses a nonprobability sampling type with a purposive sampling method. The analysis technique used in this study is multiple linear regression. The results of this study indicate that service quality can have a positive and significant effect on purchasing decisions of MSK Wings products. Product quality has a positive and significant effect on purchasing decisions of MSK Wings products. Purchasing decisions have a positive and significant effect on the Word of Mouth of MSK Wings products. Service quality has a positive and significant effect on the Word of Mouth of MSK Wings products. Product quality has a positive and significant effect on the Word of Mouth of MSK Wings products. Purchasing decisions can mediate the relationship between service quality and Word of Mouth on MSK Wings products. The purchase decision is able to mediate the relationship between product quality and Word of Mouth on MSK Wings products.