Description Available in: Foussballclub Déifferdeng 03 is a football club, based in Differdange, in south-western Luxembourg.
Differdange 03 was formed in 2003 as an amalgam of two clubs from the city of Differdange: FA Red Boys Differdange and AS Differdange. When the clubs merged, in time for the 2003–04 season, Red Boys was languishing in the bottom half of the Division of Honour, while AS was in mid-table position in the third tier of Luxembourgian football. The new club took Red Boys league position, and was promoted back into the National Division in the 2005–06 season, when the top division was expanded from twelve clubs to fourteen.