English-Medium Instruction (EMI) is a rapidly growing global phenomenon in countries where English is a second or foreign language. This book focuses on empirical research studies conducted on this growing trend in the Middle East and North Africa, an under-researched area with regards to the effects and challenges of the implementation of EMI in higher education. The contributors are researchers with first-hand experience in countries in the region, including Iran, Kuwait, Morocco, Oman, Saudi Arabia, Sudan, and Turkey. Each chapter follows a consistent structure, allowing comparisons to be drawn between policies and practices in different countries. Topics covered include investigating perceptions and attitudes of both students and lecturers, opportunities and challenges afforded by EMI, as well as the evolution of EMI practices. By exploring these issues, through the lens of a decolonial critical approach, this volume informs theory underlying research into the phenomenon of EMI in the region.