The increase in deviant workplace behavior within organizations is compelling scholars and practitioners to find an appropriate solution to control this dilemma. Therefore, this research attempts to investigate the association between ethical leadership and workplace deviance, with employees' trust as a mediator in the relationship between ethical leadership and workplace deviance in the public sector hospitals of Khyber Pakhtunkhwa (KPK), Pakistan. This research utilized survey strategy, with a quantitative method using a cross-sectional design, applied convenient sampling technique and usable questionnaires were 202 from the understudy sector. Furthermore, the Statistical Package for Social Sciences (SPSS) was utilized to screen the data. SPSS was further used for computing preliminary data analysis, for instance, normality, reliability, standard deviation, mean, and frequencies for each construct. Furthermore, correlation and regression analyses were conducted. This study found (a) a negative and significant association between ethical leadership and workplace deviance, (b) a positive and significant relationship between ethical leadership and employees' trust (c) a negative and significant association between employees' trust and workplace deviance, and (d) that employees' trust mediates between the relationship of ethical leadership and workplace deviance. Therefore, this study highlights several theoretical and practical implications and provides further insight into how workplace deviance can be controlled specifically in the public sector hospitals of KPK. Lastly, limitations and suggestions for future researches are provided.