Lochaber-Partie-Ouest is a township municipality in the Canadian province of Quebec, located within the Papineau Regional County Municipality. The township had a population of 926 in the 2021 Canadian Census.

The township is predominantly agricultural which is the main economic activity.

In 1807, a group of about 400 Scottish Highlanders settled in the area, the same year the geographic township of Lochaber Gore was created. They came from the Highlands, near Lochaber and other parts of northern Scotland. Settlement was difficult, because income from agriculture was lower than the costs of importing manufactured products from Montreal.

With the arrival of the logging industry, the settlers were able to practice agriculture during the summer, while working in the lumberjack camps during the winter, or to work in the various sawmills that developed along the Blanche River near Thurso. The logging industry also attracted many more settlers, including French Canadians, and settlement was well underway at the turn of the 19th to 20th century. The population became predominantly Francophone at the start of the 20th century.

In 1891, the township municipality of Lochaber-Partie-Ouest was created when it was split off from Lochaber Township.

In the 2021 Census of Population conducted by Statistics Canada, Lochaber-Partie-Ouest had a population of 926 living in 336 of its 358 total private dwellings, a change of 8.2% from its 2016 population of 856. With a land area of 57.39 km (22.16 sq mi), it had a population density of 16.1/km (41.8/sq mi) in 2021.

Mother tongue:

• English as first language: 8.1%
• French as first language: 90.1%
• English and French as first language: 1.2%
• Other as first language: 1.2%

List of former mayors:

This list is incomplete; you can help by adding missing items. (January 2020)

• Michel Labrecque (2001–2009)
• Jean-Pierre Girard (2013–2017)
• Pierre Renaud (2017–present)

Media related to Lochaber-Partie-Ouest at Wikimedia Commons