Commercial openness is the exchange of information, goods and services, labor, ideas and capital across borders. The rapid development of globalization and technology has created the conditions for the development of political, commercial and social relations between countries. As long as these relations are managed carefully and knowledgeably by the authorities, it is possible for each of the interlocutors to gain at the global level. The impact of foreign direct investments on countries varies depending on their level of development, economies, political and social conditions. In this research, it is aimed to determine the short- and long-term relationships between trade openness and direct foreign capital investments in Turkey for the annual data for the period 1970-2022. As a result of Johansen cointegration analysis, it was determined that when trade openness increased by 1%, foreign direct investments would increase by 4.8%, and a positive relationship was observed. In the model, the coefficient of the error correction term is negative and statistically significant, and a positive relationship was obtained in the short term. As a result of Granger causality analysis, one-way causality was obtained between the TDA variable and FDI.