Saint-Louis (French pronunciation: [sɛ̃ lwi] ⓘ) was a provincial electoral district in the Montreal region of Quebec, Canada.

It corresponded to the western half of Ville-Marie (downtown Montreal).

It was created for the 1966 election from parts of Montréal–Saint-Louis, Montréal-Outremont and Montréal-Mercier electoral districts.

Its final election was in 1989.

It disappeared in the 1994 election and its successor electoral district was Westmount–Saint-Louis.