PENGARUH GOOD CORPORATE GOVERNANCE TERHADAP NILAI PERUSAHAAN PADA PERUSAHAAN YANG TERDAFTAR DI JAKARTA ISLAMIC INDEX 70NIM.: 22108040038Hilwa SalsabilaauthorThis study aims to analyze and examine the effect of Good Corporate Governance (GCG), proxied by institutional ownership, managerial ownership, independent board of commissioners, board of director size, audit committee size, and audit quality, on firm value proxied by Tobin’s Q. The object of the study is companies consistently listed in the Jakarta Islamic Index 70 (JII70) for the 2021-2024 period. This study employs panel data regression analysis. The research sample consists of 41 companies with a total of 164 observations. The results show that, partially, institutional ownership, managerial ownership, and the size of the board of directors have a positive and significant effect on firm value. Meanwhile, the independent board of commissioners, audit committee size, and audit quality do not have a significant effect on firm value. Simultaneously, all independent variables have a significant effect on firm value. The relatively small Adjusted R-squared value indicates that variations in firm value are largely influenced by other factors outside the research model.657.42 Akuntansi2026-03-10UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS EKONOMI DAN BISNIS ISLAMThesis