Using English to teach and learn academic subjects in higher education (HE) across the globe is increasing in popularity. The overarching aim of this study is to examine the impact of English-medium instruction (EMI) on Omani engineering students' academic performance and their studies in an English-medium engineering programme in Oman. This paper reports on findings from a larger project that was intended to investigate Omani engineering students' experience of learning through the medium of

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... glish in one of the Colleges of Technology in Oman. The study adopted a qualitative interpretative approach with a case study strategy and a purposive sampling technique to look into the impact of EMI on Omani engineering students' academic performance and their studies. The sample included 12 Omani engineering and 8 engineering instructors who were interviewed along with five classroom observations. The data were collected and generated through semi-structured interviews and classroom observations. They were analysed manually, inductively and thematically using Braun and Clarke's model (2006). The findings showed that EMI had both positive and negative impacts on the students' academic performance and their studies.