The aim of this study is to evaluate the impact of top management support (TMS) on business performance (BP) through the mediating role of digital marketing (DM). To achieve this objective, a research model was developed and tested using data (n = 140) collected from marketing managers employed in different sectors of Algerian companies. Structural equation modeling (SEM) was employed for data analysis. The results support the hypotheses that TMS has a positive impact on both DM usage and BP. Additionally, the findings revealed a significant relationship between DM and BP. Finally, DM mediated the relationship between TMS and BP. However, this study makes theoretical contributions by examining many of the known relationships between variables; it also contributes empirically and expands the scope of the literature, while leaving certain aspects for future research. Our findings can also help decision-makers and economic policymakers develop digital marketing and TMS by designing effective management tools that improve the efficiency of Algerian companies.