Le Haut-Saint-Laurent (French pronunciation: [lə o sɛ̃ lɔʁɑ̃], lit.

'Upper Saint Lawrence') is a regional county municipality in southwestern Quebec, Canada, in the Montérégie region.

It is named for the Saint Lawrence River, which forms its western and its northwestern boundaries.

The RCM was formed on January 1, 1982, from most of historic Huntingdon County.

Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[9]