Abstract. This research examines the effect of institutional quality on economic growth in West Africa. Several dimensions of institutional quality are used: the composite index of institutional quality, three aggregate indicators (economic, political, and institutional governance), and the World Bank's six governance indicators. Using a sample of 15 countries, we estimate a panel data model using the Augmented Mean Group method, whose robustness is reconfirmed by the Driscoll-Kraay method over the period 2000-2023. We obtain three main results: first, the composite institutional quality index promotes economic growth. Second, economic, political, and institutional governance stimulate economic growth. Ultimately, the six governance indicators have a positive influence on economic growth. The results suggest a general improvement in the quality of institutions. In particular, these countries must fight corruption, have sound and robust regulations, strengthen the principles of the rule of law, have qualified administrative staff, maintain political stability, and promote democratic principles.

Keywords: institutional quality, economic growth, AMG, Driscoll–Kraay, West Africa.