The primary objective of this research is to examine the relationship between Good Corporate Governance (GCG), value chain, and bank asset growth in Indonesian State-Owned banks. Additionally, this study aims to determine whether value chain mediates the relationship between GCG and bank asset growth. This research employs a quantitative method. Data is collected using a questionnaire with a Likert scale ranging from 1 to 7. The respondents in this study are employees and managers working in state-owned banks in Indonesia. The total sample size used in this research is 239 samples. Data analysis is conducted using SmartPLS 4 software. The results of this study demonstrate that GCG has a significant positive relationship with the value chain of the bank. However, the direct relationship between GCG and bank asset growth is not statistically significant. The results of the mediation analysis show that value chain mediates the relationship between GCG and bank asset growth, emphasizing the critical role of value chain in optimizing the impact of GCG on bank asset growth.