This study aims to determine the effect of solid corporate Governance on investment and financing decisions based on the shariah stock return of the Jakarta Islamic Index between 2017 and 2020. This quantitative analysis uses secondary data, with the Jakarta Islamic Index-listed companies as the population. A systematic sampling method based on preset criteria was utilized to collect samples. From 2017 through 2020, ten companies included in the Jakarta Islamic Index make up the sample. Multiple Regression Analysis (MRA) was used to assess the outcomes of this investigation. A Simple Regression Analysis (SRA) was conducted to determine the direct relationship between the variables. The investment choice variable influences business value positively and statistically significantly, which is inversely proportional to the funding decision variable, which influences business value positively but statistically insignificantly. In addition, the Moderated Regression Analysis (MRA) test suggests that GCG can moderate the relationship between investment and funding decisions and enterprise value. **** Penelitian ini bertujuan untuk mengetahui peran Good Corporate Governance (GCG) dalam memoderasi keputusan investasi dan pendanaan terhadap nilai saham syariah perusahaan yang terdaftar di Jakarta Islamic Index antara tahun 2017 dan 2020. Penelitian kuantitatif menggunakan data sekunder, dengan populasi yang terdiri dari perusahaan yang terdaftar di Jakarta Islamic Index. Purposive sampling dengan kriteria tertentu digunakan untuk memperoleh sampel. Sampel terdiri dari 10 perusahaan yang terdaftar di Jakarta Islamic Index periode 2017-2020. Analisis regresi sederhana digunakan untuk melihat hubungan langsung dan Multiple Regression Analysis (MRA) untuk menganalisis hubungan moderasi dalam penelitian ini. Berdasarkan pengujian variabel keputusan investasi berpengaruh positif dan signifikan terhadap nilai perusahaan, yang berbanding terbalik dengan variabel keputusan pendanaan yang berpengaruh positif tetapi tidak signifikan terhadap nilai perusahaan. Selanjutnya, menurut uji Moderated Regression Analysis (MRA), GCG dapat memoderasi hubungan antara keputusan investasi dan pendanaan terhadap nilai perusahaan. How to cite: Kharisma, A. B., & Indriyani, F. (2022). The role of good corporate governance in the relationship between investment and funding activities on the value of sharia shares. Indonesian Journal of Islamic Economics Research, 4(1),