Numerous studies in recent decades have examined the dimensions and consequences of internal migration in Iran. Using a scoping review and Arksey and O'Malley methodological framework, this article examines studies of internal migration in the last three decades to provide a comprehensive picture of the characteristics, dimensions, determinants and consequences of internal migration in Iran. The results indicate the dominance of quantitative methods and survey data in internal migration studies. More than half of studies focused on rural-urban migration and about one-fifth on migration flows and its consequences to Tehran province. Also, according to the results, more than 52% of studies examined determinants of internal migration, 31% various consequences of migration at the origin and destination, 13% internal migration trends and patterns and finally, 3% demographic characteristics of migrants. In addition, the results showed that unequal development, centralization of economic and educational facilities and opportunities, climate change, income disparities, job acquisition and social networks are among the most important factors underlying internal migration in Iran. However, the field of internal migration in the country needs using new indicators and criteria for international comparisons, addressing the emerging dimensions and patterns of migration and using the methodology of qualitative studies.