This study aims to analyze the effect of ZIS (Zakat, Infaq, and Sadaqah) service quality on the satisfaction and loyalty of muzakki at LAZISMU Ponorogo, as well as to examine the role of muzakki satisfaction as an intervening variable. The research employed a quantitative approach with a population of 200 muzakki and a sample of 135 respondents, determined using the Slovin formula with a simple random sampling technique. Data were collected through questionnaires and analyzed using IBM SPSS Statistics, including validity testing, reliability testing, path analysis, t-test, F-test, and the coefficient of determination (R²).

The results indicate that all research instruments were valid and reliable. Service quality had a positive and significant effect on muzakki satisfaction, with a path coefficient of 0.896, a t-value of 23.263, and an R² value of 0.803, indicating that service quality explained 80.3% of the variation in muzakki satisfaction. Service quality had a positive but insignificant direct effect on muzakki loyalty, with a coefficient of 0.137, a t-value of 1.439, and a significance value of 0.152. In contrast, muzakki satisfaction had a positive and significant effect on muzakki loyalty, with a coefficient of 0.748, a t-value of 7.839, and a significance value of 0.001. The indirect effect of service quality on muzakki loyalty through muzakki satisfaction was 0.670, which was greater than the direct effect of 0.137, indicating that muzakki satisfaction significantly mediated the relationship between service quality and muzakki loyalty. Overall, service quality and muzakki satisfaction explained 76.3% of the variation in muzakki loyalty. The study concludes that improving service quality will be more effective in enhancing muzakki loyalty when it first increases muzakki satisfaction.

Keywords: ZIS Service Quality, Muzakki Satisfaction, Muzakki Loyalty, LAZISMU Ponorogo, Intervening Variable, Path Analysis.