The effects on growth of export diversification has been widely discussed in the economic literature, although there is currently no clear consensus on the subject on the virtues of an economic development strategy based on export diversification. This study analyzes the dynamic relationship between relationship between export diversification and economic growth in Tunisia, through the cointegration analysis based on an autoregressive distributed lag (ARDL) bounds testing approach with annual data for the period 1991-2017. The results show that growth based on export diversification is relevant for Tunisia. The econometric study has shown that investment, export diversification, increase in exported products and quality of life have a positive effect on economic growth, while financial development has a negative impact in the long term. However, the short-term impact of export diversification is more limited. The findings have economic policy implications for policymakers seeking to strengthen and improve the export diversification, stability and economic growth of their economies.