The Roman Catholic Diocese of Saint-JeanâÂÂLongueuil () is a suffragan of the Metropolitan Archdiocese of Montréal in (mostly francophone) Québec, southeastern Canada.
Its cathedral episcopal see is the Cathédrale Saint-Jean-lâÂÂÃÂvangéliste dedicated to John the Evangelist, in Saint-Jean-sur-Richelieu. The Diocese also has a co-cathedral, dedicated to Saint Anthony of Padua, in Longueuil and a minor basilica: Basilique Sainte-Anne-de-Varennes, in Varennes.
As per 2015, it pastorally served 634,425 Catholics (83.2% of 762,240 total) on in 45 parishes and 1 mission with 89 priests (60 diocesan, 29 religious), 4 deacons, 350 lay religious (99 brothers, 251 sisters) and 4 seminarians.
(all Roman Rite native Canadians)