The aim of this study was to determine the effect of service quality dimensions consisting of (tangible, reliability, responsiveness, assurance and empathy) on customer loyalty in the pharmacy Dinda Farma in Klaten. This study also aims to determine simultaneously the influence of the five dimensions contained in the independent variable on the dependent variable and to know the dimensions of which peling dominant influence among the five dimensions contained in the independent variable on the dependent variable. This type of research is a quantitative research, with a population of customers in pharmacy Dinda Farma with a sample of 90 people. Purposive sampling or based on certain characteristics. Research data collection techniques throug...