Red Boys was founded as SC Differdange in 1907, the year after Luxembourg's first club, Fola Esch, had been set up.

Despite the clubs provenance, its first appearance in Luxembourg's league as Red Boys Differdange came only in 1919[1] (and, then, only in the second division).

Despite fading after the Second World War, Red Boys remained one of the largest and most successful teams in Luxembourgish football.

Differdange's record was most impressive in the Luxembourg Cup, which the club won more times than any other team (15).

Red Boys Differdange qualified for UEFA European competition ten times.