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This study aims to analyze the effect of capital structure, firm size, and liquidity on firm value in the coal subsector listed on the Indonesia Stock Exchange (IDX) during the 2018-2022 period. The background of this study is the importance of the coal subsector in the Indonesian economy as well as the challenges faced by companies in maintaining firm value amid fluctuating energy prices and policies. This research uses quantitative methods with a multiple linear regression analysis approach. The study population consisted of coal subsector companies listed on the IDX, with the sampling technique using purposive sampling. The approximate number of samples taken was 28 companies with 140 data collected in 5 years. The data used is secondary data in the form of financial reports of companies listed on the IDX coal subsector. The research location is on the Indonesia Stock Exchange, with a research period from 2018 to 2022. The independent variables in this study consist of capital structure, firm size, and liquidity, while the dependent variable is firm value. The results showed that capital structure has a significant influence on firm value, while firm size and liquidity do not have a significant influence on firm value.