Ligny-en-Barrois is a commune in the Meuse department in Lorraine in north-eastern France.
The town is in the arrondissement of Bar-le-Duc, beside the canal that links the Rivers Rhine and Marne, fifteen kilometres to the south east of Bar le Duc: it is the administrative seat of the canton Ligny-en-Barrois. The population comprises 5,035 inhabitants (1999) and the area of Ligny is 32.26 km². The inhabitants are called in French Linéens.
A principal employer is the French Evobus motor bus assembly plant. Ligny is also the home town of the Essilor company which specialises in ophthalmic lens production.
Twin towns – Sister cities
Ligny-en-Barrois is twinned with:
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