迪弗当日是卢森堡的城镇，位于该国西南部，由卢森堡区负责管辖，面积22平方公里，海拔高度277至427米，2011年人口20,979，人口密度每平方公里950人。

Differdange (Luxembourgish:Déifferdeng, German:Differdingen) is a commune with town status in south-western Luxembourg. Differdange is an industrial town that was home to much of Luxembourg's steel production, and lies near the borders with Belgium and France. It is in the canton of Esch-sur-Alzette, which is part of the district of Luxembourg.