Marcq-en-Barœul (French pronunciation: ​[maʁk ɑ̃ baʁœl]; Picard: Marke-in-Bareul; older Dutch: Marke) is a commune in the Nord department in the Hauts-de-France region in northern France. It is a suburb of the city of Lille, and is immediately adjacent to it on the northeast. It is the sixth-largest component of the Métropole Européenne de Lille. Marcq-en-Barœul is known as the most affluent suburb city of Lille, it is part of the 'Triangle d'or' (Golden triangle) of Lille. It features expensive real estate, especially alongside the Grand Boulevard and Hippodrome des Flandres racecourse. The city is also home to one of the campuses of the elite international private collège and lycée active bilingue Jeannine-Manuel.