This research explores the extent to which workplace spirituality (WPS) fosters innovative work behavior (IWB), highlighting the intermediary function of knowledge sharing (KS) among logistics employees in Vietnam. Adopting a quantitative methodology, data were gathered via structured surveys from employees in logistics firms. The relationships among WPS, KS, and IWB were tested using structural equation modeling (SEM) to assess both direct and indirect pathways. The findings provide strong support for all proposed hypotheses. WPS significantly predicts KS and IWB, while KS also positively influences IWB. Furthermore, KS was found to positively affect IWB and partially mediate the relationship between WPS and IWB. The results highlight that WPS creates psychological and relational conditions that foster knowledge exchange, which in turn facilitates innovative behaviors. By applying Person-Organization (P-O) fit theory, this study offers new theoretical perspectives through the integration of WPS, KS, and IWB. It extends prior research by empirically validating KS as a mechanism through which WPS translates into innovation-related outcomes, particularly in the underexplored context of the logistics sector in Vietnam. This study yields meaningful implications for researchers and organizational leaders interested in leveraging WPS to enhance innovation among employees.