Beauharnois-Salaberry is a regional county municipality in the Montérégie region of Quebec, Canada. Its seat is Beauharnois.

The RCM was formed by combining the historic counties of Beauharnois and Châteauguay.

There are 7 subdivisions within the RCM:

Historical Census Data – Beauharnois-Salaberry Regional County Municipality, Quebec

Year	Pop.	±%
1991	59,785	—
1996	59,769	−0.0%
2001	59,137	−1.1%
2006	60,802	+2.8%
2011	61,950	+1.9%
2016	64,320	+3.8%

Canada Census Mother Tongue – Beauharnois-Salaberry Regional County Municipality
Census		Total		French				English				French & English				Other
Year		Responses		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %
2016		63,060		59,430	2.5%	94.2%		2,050	6.5%	3.3%		595	7.8%	0.9%		985	61.5%	1.6%
2011		61,180		58,000	2.6%	94.80%		1,925	13.6%	3.15%		645	84.3%	1.05%		610	25.6%	1.00%
2006		59,405		56,540	2.1%	95.18%		1,695	4.8%	2.85%		350	14.6%	0.59%		820	60.8%	1.38%
2001		58,060		55,360	1.7%	95.35%		1,780	13.4%	3.07%		410	14.6%	0.71%		510	20.0%	0.88%
1996		58,790		56,315	n/a	95.79%		1,570	n/a	2.67%		480	n/a	0.82%		425	n/a	0.72%

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

• Beauharnois Canal
• Beauharnois Hydroelectric Generating Station (Melocheville)
• Deux-Rives Ecomuseum (Salaberry-de-Valleyfield)
• Howick Airport (Saint-Étienne-de-Beauharnois)
• Pointe-du-Bruisson Archaeological Park (Melocheville)
• Valleyfield Airport (Saint-Stanislas-de-Kostka)

Protected areas:

• Îles-de-Paix National Fauna Reserve
• Îles-de-Saint-Timothée Regional Park

• List of regional county municipalities and equivalent territories in Quebec

• Media related to Beauharnois-Salaberry Regional County Municipality at Wikimedia Commons