Sillegny (French pronunciation: [sileɲi]; also Sillégny; German: Sillningen) is a commune in the Moselle department in Grand Est in north-eastern France.

Loiville, a hamlet belonging to the commune, is situated in the north, over the Rû des Crux in the direction of Coin-sur-Seille.

The Roman road which connected Lyon to Trier runs west from the village along the Forêt Dominale des Six Cantons forest.

In 1246 the bishop Jacques ceded the village to Sainte Marie abbey but the Diocese kept St. Martin church until the French Revolution.

From 1871 to 1918 and between 1940 and 1945, when Alsace and Lorraine were annexed by Germany (see Treaty of Frankfurt (1871)), Sillegny became a German town renamed Sillningen situated in the Imperial Province of Elsass-Lothringen.