Nădlac is a town located in the western part of Arad County in Romania. It serves as an international border town and functions as the primary gateway for entry into western Romania from Hungary, situated approximately 50 km (31 mi) from the county capital.
The town is notable for its historical geography, as a former part of Nădlac lies across the current border in Hungary under the name Nagylak. Additionally, Nădlac serves as a significant cultural center for the Lutheran Slovak community within Romania.