The view that economic growth and foreign trade are in close interaction is one of the topics that has been frequently discussed in the applied literature in recent years. With the studies carried out, the relationship between economic growth and foreign trade (export, import) has been the subject of research in different dimensions. The aim of this study is to determine the causality relationship between foreign trade and economic growth in Turkey after the Customs Union. For this purpose; the data of the export and import variables representing foreign trade and the data of the GDP variable representing economic growth are handled annually, covering the period 1996-2019. Co-integration and causality relationship was examined by considering the increase in amounts of economic growth, import and export variables. The result obtained supports the assumption of growth supported by export-led growth. While the series that were applied unit root tests were not stationary at the level value, they became stationary at the I(1) level and were examined with the Johansen cointegration test. It has been determined that there is a long-term cointegration relationship between the series. As a result of the Granger dual causality test, it was determined that there is unidirectional causality from exports to economic growth.