In the field of English medium instruction (EMI), multilingual research approaches are crucial to carrying out effective and ethically responsible research, because EMI policies and practices are inherently multilingual. This paper is a partial replication study that adopts a 'researching multilingually' analytical framework to interrogate the challenges and affordances of using multiple languages during two EMI research projects. In the project in Turkey, the lead researcher, who is an English-Turkish bilingual, analysed policy documents (n = 145) and interview data (n = 67) drawing on her knowledge of both languages. Additionally, 85 EMI classroom observations were conducted. In the project in China, the research team of two L1 English speakers and two L1 Chinese speakers investigated 93 bilingual policy documents and conducted interviews with 26 policy arbiters by drawing on both languages during data collection and analysis. Together, these reflections highlight how multilingual approaches can be utilised throughout the research process, from team formation, research design, data collection, data analysis, and presentation of findings in research reports.