Analysed through the lens of language ideology, this qualitative study delved into the multilingual experiences of Chinese international students in English-medium instruction (EMI) studies in Germany. Drawing on semi-structured interview data from 16 Chinese postgraduate students in an international university, this study probed into these students' language ideologies related to English, German, and Mandarin Chinese. Data analysis showed that their language ideologies were complex and intertwined with academic success, social integration, future employment, solidarity within ethnic groups, and widening local networks. It was also found that the participants' multiple while often conflicting language ideologies were pivotal in shaping their investment in and usage of particular languages. The findings of this study contribute to a deeper understanding of the diversity inherent in international students' language ideologies in EMI and have significant implications for the internationalisation of multilingual environments in higher education (HE).