In the 11th century, Sillegny belonged to the abbey of Saint Pierre, and one century later to the Bishopric of Metz.
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.