This research seeks to identify the mechanisms through which audit quality indicators can strengthen public trust and enhance organizational social capital. The research method is applied in terms of purpose and mixed in nature. In the quantitative part, correlation and multivariate regression analysis were used to test hypotheses, and financial data of listed companies were analyzed in the period 2019-2023. In the qualitative part, semi-structured interviews with experts and qualitative content analysis were used. The time horizon of the research is cross-sectional-longitudinal, and the main variables include audit quality indicators - including auditor experience and expertise, independence, size of the audit firm, and type of opinion - public trust, and organizational social capital .The research findings show that audit quality indicators explain a total of 58.7% of the changes in public trust and organizational social capital, and among the three categories of indicators, process indicators (such as the percentage of hours of participation of the responsible partner) with a beta coefficient of 0.391 have the greatest effect on input and output indicators. Path analysis with SmartPLS software also showed that audit quality (path coefficient of 0.684) strengthens public trust; this finding is consistent with the content which identified active participation of the responsible partner and transparency of the audit process as the most important perceptual factors of trust-building from the perspective of stakeholders. Accordingly, prioritizing strengthening audit process indicators can be a specific and measurable strategy for promoting the health of the Iranian capital market and the trust of stakeholders.