This paper introduces the Immigrant German Election Study (IMGES) as the first survey that explicitly targeted immigrant-origin voters in Germany. IMGES fills the gap of insufficient data in the field of immigrant-origin voters with a combination of proven and novel survey measures of the electoral behavior of people with a background from either Türkiye or from the former Soviet Union or its successor states. The study was carried out in a post-election, cross-sectional survey in 2017. Its compatibility with the German Longitudinal Election Study (GLES), the Ethnic Minority British Election Study (EMBES), and the Dutch Ethnic Minority Election Study (DEMES) allows for in-depth comparative analyses between immigrant-origin voters and natives across different countries. In addition to standard measures of electoral behavior, the data include measures of immigrant-specific factors relevant to voting behavior. Moreover, the dataset is not limited to voting behavior in Germany, it also includes transnational voting behavior in the respective countries of origin.