In recent years, the increasing frequency of geopolitical shocks and environmental disruptions has further highlighted the need to strengthen supply chain resilience. In this regard, the present study aimed to examine the effects of the dimensions of big data analytics capabilities (technological, managerial, and personnel) on online retail supply chain resilience, as well as the moderating role of geopolitical shocks. The study was applied in terms of purpose and quantitative in terms of method, and the data were collected through a questionnaire from a sample of 199 respondents drawn non-probably and purposively from a population of 359 managers, regional supervisors, and specialists active in Iranian online retail platforms. Data were analyzed using partial least squares structural equation modeling (PLS-SEM). The results showed that in Iranian online retail platforms, technological and managerial capabilities had positive and significant effects on resilience. Although personnel capabilities alone did not have a significant effect on resilience, the findings confirmed that geopolitical shocks positively and strongly moderated this relationship. These results suggest that personnel expertise in the field of data is a contingent capability whose value emerges under conditions of crisis and external shocks. This study emphasizes the complementary role of technological and managerial capabilities as stable foundations of resilience, alongside the strategic importance of data-driven personnel expertise in times of crisis and geopolitical shocks. The findings of this study are limited to the Iranian online retail sector, and their generalizability to other segments of the supply chain requires further investigation.