The Metropolitan Archdiocese of Lille (Latin: Archidioecesis Metropolitae Insulensis; French: Archidiocèse Metropolitain de Lille)[pronunciation?]

Its cathedral episcopal see is a Marian Minor Basilica: Basilique-cathédrale Notre-Dame de la Treille, in Lille, Nord, Hauts-de-France.

Erected on 25 October 1913 originally as the Diocese of Lille, a suffragan of the Metropolitan Archdiocese of Cambrai, on territory split off from the then Metropolitan Roman Catholic Archdiocese of Cambrai, it encompasses the arrondissements of Dunkerque and Lille, within the department of Nord in the Region of Nord-Pas-de-Calais.

It was elevated to a Metropolitan Archdiocese by Pope Benedict XVI on March 29, 2008.

Its ecclesiastical province comprises the Metropolitan's own Archdiocese and two suffragan sees :