The Cross de l'Acier was an annual cross country running competition held in late November in Leffrinckoucke, France. First held in 1990, it was one of the foremost competitions of its type in France. Ten races were held at the event for athletes of varying abilities. Around 2200 runners took part in the day's event in 2010. Due to the COVID-19 pandemic and disagreements with the National Athletics League, it was announced that the race would be discontinued in 2022 after two years absence.