Nădlac (Hungarian: Nagylak, Slovak: Nadlak) is a town in western Romania, Arad County. A former part of the town lies across the border with Hungary; this village is called Nagylak. An international border town, Nădlac is the main border crossing into western Romania from Hungary. It is also a centre of the Lutheran Slovak community in Romania. Situated in the western part of Arad County, 50 km from the county capital, at the western border of Romania, Nădlac is the main entrance gate from Western Europe.
Nădlac was first mentioned in documents in 1313 when it was known as Noglog. The traces of inhabitancy in this region are lost in the darkness of time.
The town's name in Hungarian language means "big place". The Romanian and Slovak names derive from that.