La Haute-Yamaska (, ) is a regional county municipality in the Estrie region of Quebec, Canada. Its seat is Granby.
It is named for its position at the height of the Yamaska River, which cuts through its southern part. It rises at Brome Lake located in neighbouring Brome-Missisquoi Regional County Municipality.
On January 1, 2010, the city of Bromont left La Haute-Yamaska; it was reclassified to the Brome-Missisquoi RCM.
In 2021, it was transferred to the Estrie region from Montérégie.
There are 8 subdivisions within the RCM:
Mother tongue from Canada 2021 Census
Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:
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