Abstract The Combined International Trade and Investment Data (CITID) represents a new innovative and comprehensive data landscape that combines firm-level data focused on international trade and investment. The datasets are sourced from both the Deutsche Bundesbank and the Federal Statistical Office of Germany, ensuring a reliable and robust data landscape. Within the CITID, multiple individual datasets seamlessly merge, encompassing a wide range of information. These include data on trade in goods, trade in services, inward and outward foreign direct investment (FDI), as well as information on international financial and capital transactions along with additional firm-level data. The data enables a holistic understanding of firms’ international integration, previously unattainable, and offers new opportunities for analyzing global trade dynamics. The data will be accessible for research. This paper provides a comprehensive description of the individual datasets, including information about their combinability, the methodology for matching them, the data’s content, and its potential for further research.