The club was founded in 1919 and have never played in a higher division than Ligue 2. They have once made it to the semi-finals of the Coupe de France, in 1929, and the quarter finals four times in 1930, 1937, 1968 and 1971.
The club is linked with and has had ties with Dartford FC of Kent, England.
In 1990, Belgian player Jean-Marc Bosman sought to move from RFC Liège in his home country to USL Dunkerque after his Belgian contract expired. However, RFCL demanded a transfer fee, quashing the proposed move. Bosman then sued to have this reserve system outlawed, and in 1995 he won his case before the European Court of Justice. The ECJ ruling, known ever since as the Bosman ruling, led to major structural changes in the business of European footballers' contract sales.