Previous studies in various industries have shown different results regarding the effect of fundamental factors on a company's profitability. Therefore, this study aims to analyze the effect of corporate social responsibility disclosure, firm size, and financial factors on profitability of telecommunication companies listed on Indonesia stock exchange from 2016 to 2021. The variables used in this study were CSR, CR, DAR, TATO, and firm size as independent variables and ROA ad dependent variable. This study used quantitative method by collecting secondary data from quarterly financial reports with sample of six (6) telecommunication companies and 144 sample data observations were obtained. This study was analyzed using statistical method, namely T-Test and panel data regression to test all the hypotheses. Based on the results of this study of data analysis using a partial test (t-test) indicated that CR partially have a negative effect on ROA. Whereas the remaining independent variable partially have a positive effect on ROA in Indonesia telecommunication companies. Meanwhile, CSR, CR, DAR, TATO, and firm size simultaneously have a significant positive effect of ROA. The results of this study can be used as a reference for further research related to corporate social responsibility disclosure, firm size, financial factors, and profitability. For practical implications, shareholders can assess the company's performance not only based on profitability information, but also by interpreting CSR.