Grosse-Île is one of two municipalities forming the urban agglomeration of Îles-de-la-Madeleine in Quebec, Canada. It is part of the Gaspésie–Îles-de-la-Madeleine region, and its population was 464 as of the 2021 Census.

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Grosse-Île Grosse-Île
Municipality
Saint Peter's By the Sea, Old Harry, Grosse-Île
Location within Les Îles-de-la-Madeleine TE.
Grosse-Île Location in eastern Quebec.
Coordinates: 47°37′N 61°31′W
Country	Canada
Province	Quebec
Region	Gaspésie–Îles-de-la-Madeleine
RCM	None
Agglomeration	Îles-de-la-Madeleine
Constituted	January 1, 2006
Government [1]
• Mayor	Rose Elmonde Clarke
• Federal riding	Gaspésie—Îles-de-la-Madeleine
• Prov. riding	Îles-de-la-Madeleine
Area [1][2]
• Total	96.60 km2 (37.30 sq mi)
• Land	32.28 km2 (12.46 sq mi)
Population  (2021)[2]
• Total	464
• Density	14.4/km2 (37/sq mi)
• Pop 2006-2011	0.2%
• Dwellings	252
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Postal code(s)	G4T 6B9
Area code(s)	418 and 581
Highways	R-199
Website	www.mungi.ca

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As part of a municipal reorganization across Quebec, the seven communities^[which?] of the Magdalen Islands amalgamated to form the municipality of Les Îles-de-la-Madeleine on January 1, 2002. However, after a 2004 referendum, Grosse-Île decided to split from the municipality, effective January 1, 2006.^[3]

Located on Grosse-Île island (French for Big Island) between the villages of Grande-Entrée (south) and House Harbour (southwest), it was settled during the late 18th century by Scots. French-speaking people would come and establish themselves just after, as seen by a Catholic parish founded in 1793.

Old Harry is a hamlet and fishing village located within the municipal boundaries of Grosse-Île, which lies at the junction of Île de la Grande Ouverte and Île de l'Est. It was first mapped by Joseph Frederick Wallet Des Barres (1769 and 1776) and later by Admiral Henry Wolsey Bayfield (1837), where the name was recorded as Old Harry Head. The toponym derives from Scotsman Harry Clarke, who was for many years the only occupant of the cape (or head). Many of his descendants still bear the surname Clarke.

Grosse-Ile and Entry Island is one of the two communities where English is the main language spoken, in the field and at sea, the age-old and daily exchanges have created and still create close relationships between the English- and French-speaking communities and individuals of the archipelago.^[4]

Former name Old-Harry Beach stretches over 9 km between Old Harry Point and East Point where is located the Pointe de l'Est National Wildlife Area, with its unique maritime environment, the area is currently used by more than 150 bird species and 10 or so mammal species.^[5]'^[6] The Pointe de l'Est National Wildlife Area is located on La Grosse Île, the reserve occupies an area of 748 hectares of the village of Grosse-Île territory's

The hamlet of Old-Harry is located on the point of the same name, in the municipality of Grosse-Île, at the junction of Île de la Grande Entrée and Île de l'Est.^[7]

• On Grosse-Île
• Old-Harry (Hamlet),^[8] in port, 5 boats pulled on the wood-covered beach (slips) 1996

Quebec's only salt mine is located on Grosse Île, and is operated by Seleine Mines, which is owned by Windsor Salt.

In 1972, the Société Québécoise d’Exploration Minière (SOQUEM)^[15] discovered 7 salt domes,^[16] including the one at Grosse-Île. In 1982, after investments of C$125 million, Seleine Mines inaugurated an active underground mine on Grosse Île. In 1988, the company was sold to the Canadian Salt Company (Windsor), and in 2009, the mine passed into the hands of the German group K+S and later to Stone Canyon Industries.

About 150 people work at Seleine Mines, and every year, more than 1,300,000 t (1,300,000 long tons; 1,400,000 short tons) metric tons of salt are extracted there, this salt is used for road deicing.

• List of anglophone communities in Quebec
• List of municipalities in Quebec