Côte-Saint-Luc, city, Montréal region, southern Quebec province, Canada, located on Île de Montréal (Montreal Island). It is a western (mainly residential) suburb of Montreal city. The place-name was applied in the 17th century to hunting land that was held by the seigneurs of Île de Montréal. A farming settlement of 209 people was recorded in 1818. Inc. village, 1903; town, 1951; city, 1958. Pop. (2006) 31,395; (2011) 32,321.