Differdange (, ) 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.
, the town of Differdange, which lies in the centre of the commune, has a population of 10,248. Other towns within the commune include Lasauvage, Niederkorn, and Oberkorn.
Differdange Castle, located on a hill in the centre of the town, dates from 1577 although there was an earlier fortified castle of Differdange dating from around 1310. Today's residential castle is used by Miami University.
Differdange is home to Miami University's Dolibois European Center and the Centre for Population, Poverty and Public Policy Studies (CEPS/INSTEAD).
It is also home to football team FC Differdange 03.