The aim of this study is to explore teachers' attitudes towards the shift to English as a medium of instruction in Qatari Independent schools. It focuses on the advantages and disadvantages of this approach for teachers and students, and the challenges they face in the process of its implementation. Data for the study were collected by means of a questionnaire and follow-up interviews. Findings point to teachers' beliefs that while the approach has benefited them and their students, it is a challenging process. The challenges teachers face are organizational in nature relating to ineffective planning for the introduction of the change, lack of teacher preparedness for its implementation, and parents' resistance to this change. These results have implications for teacher training in the Qatari context and for planning of the introduction of change in English as a Second Language or English as a Foreign Language contexts.