Sainte-Catherine (French pronunciation: [sɛ̃t katʁin] ) is an off-island suburb of Montreal, in southwestern Quebec, Canada, on the St. Lawrence River in the Regional County Municipality of Roussillon. The population as of the Canada 2011 Census was 16,762.

The land had been occupied for more than three centuries, since the establishment of the Iroquois mission in 1676, it is only in 1937 that the founding of la paroisse de Sainte-Catherine de Laprairie really marks a territorial organization. In 1973, a demographic boom finally granted the status of town to the village. In 2006, according to the city's official site, there were 17,000 inhabitants in Sainte-Catherine.

The inauguration of the Honoré Mercier Bridge in 1934, and then of the Champlain Bridge in 1962, greatly boosted the local economy.

In the 2021 Census of Population conducted by Statistics Canada, Sainte-Catherine had a population of 17,347 living in 6,909 of its 7,016 total private dwellings, a change of 1.8% from its 2016 population of 17,047. With a land area of 9.37 km (3.62 sq mi), it had a population density of 1,851.3/km (4,794.9/sq mi) in 2021.

Canada Census Mother Tongue – Sainte-Catherine, Quebec
Census		Total		French				English				French & English				Other
Year		Responses		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %
2016		16,980		14,950	0.6%	88.04%		630	0.06%	3.71%		155	10%	0.91%		1,100	34.96%	6.47%
2011		16,670		15,040	0.8%	90.22%		675	39.2%	4.05%		140	40.0%	0.84%		815	61.4%	4.89%
2006		16,005		14,915	1.4%	93.19%		485	28.7%	3.03%		100	4.8%	0.62%		505	11.0%	3.16%
2001		15,945		14,705	14.0%	92.22%		680	41.7%	4.26%		105	0.0%	0.66%		455	97.8%	2.85%
1996		13,710		12,895	n/a	94.06%		480	n/a	3.50%		105	n/a	0.76%		230	n/a	1.68%

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