Illingen (German pronunciation: [ˈɪlɪŋən]) is a municipality in the district of Neunkirchen, in Saarland, Germany.

Illingen is a large, well maintained village with a pleasant castle complex, including a small modern Hotel with restaurant.

Trains travel in the direction of Saarbrücken to the south and Lebach-Jabach to the north.

The earliest written documentation which exists about Illingen is from the late 9th century.

The Freiherr von Kerpen lived in the castle until the late 19th century.