This study investigates the intricate relationship between employees' green values and their perceptions of greenwashing in corporate social responsibility (CSR)-oriented organizations. Specifically, it examines the mediating role of person-organization (P-O) fit in this dynamic. Adopting a rigorous mixed-methods research design, the study integrates quantitative data from a survey of 326 private sector employees in Turkey with qualitative content analysis of sustainability reports from 36 companies listed in the BIST Sustainability Index (BIST SI). The findings reveal a significant positive association between employees’ green values and their perceptions of greenwashing, with P-O fit emerging as a crucial mediating mechanism. By elucidating how value congruence within organizations influences employee responses to greenwashing practices, this study advances theoretical understanding and provides actionable insights for CSR-oriented firms seeking to enhance their credibility and alignment with employee values. These findings emphasize the importance of fostering a strong person-organization fit to mitigate greenwashing concerns and strengthen organizational trust.