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Abstract: „Within the European Union, the Greater Region Saar-Lor-Lux is the region most impacted by cross-border work. Luxembourg is attracting an increasing number of workers from neighboring countries, mainly from France. This article examines how the practice of cross-border work has evolved over the last sixty years and what the territorial issues are. Rarely taken into account over a long period, the historical dimension is indeed necessary to understand the roots of the phenomenon, its structuring and diversification. The degree of permeability of borders and the reasons for crossing them have changed over time. This analysis provides an overview of cross-border work, focusing on Luxembourg as the main country of employment and Lorraine as the main place of residence for cross-border workers. Contextual factors and different processes - historical, economic, social and political - are important and have encouraged the development of cross-border work in the Greater Region: they have contributed to its institutionalization and to the structuring of the phenomenon. Finally, borders are questioned in the light of emerging territorial challenges, such as labour shortages, the ageing of the population and the resulting tensions pertaining to cross-border work.“