Mobility and Exchange across Borders presents the proceedings of Sessions XXXIVIV and XXXIV-V of the 18th UISPP World Congress (Paris, June 2018). Over the last few decades, the study of cultural interactions in the Iron Age has been considerably renewed thanks to the application of new methods and tools, opening the way to new research perspectives. The papers provide different examples from various archaeological contexts and regions while applying new methodologies able to highlight the diversity of cultural transfers. Their purpose is to stimulate a debate on human interactions and cultural transfers in order to open up new analytical perspectives on this topic and to critically examine the markers and approaches traditionally used to identify human and object mobility during the first millennium BC. Through the different approaches and perspectives presented herein, this volume aims to contribute to the renewal of the scientific debate on mobility and interactions as important drivers of societal change and to stimulate future research and debate.