Soisy-sous-Montmorency (French pronunciation: [swazi su mɔ̃mɔʁɑ̃si] ^ⓘ, literally Soisy under Montmorency) is a commune in the Val-d'Oise département located 15.3 km (9.5 mi) north of Paris, France.

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Soisy-sous-Montmorency
Commune
Place Sestre, the Wallace fountain
Coat of arms
Location (in red) within Paris inner and outer suburbs
Location of Soisy-sous-Montmorency
Soisy-sous-Montmorency Show map of France Soisy-sous-Montmorency Show map of Île-de-France (region)
Coordinates: 48°59′19″N 2°18′02″E
Country	France
Region	Île-de-France
Department	Val-d'Oise
Arrondissement	Sarcelles
Canton	Montmorency
Intercommunality	CA Plaine Vallée
Government
• Mayor (2020–2026)	Luc Stréhaiano[1]
Area 1	3.98 km2 (1.54 sq mi)
Population  (2021)[2]	18,008
• Density	4,500/km2 (12,000/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	95598 /95230
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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On 7 August 1850, a part of the territory of Soisy-sous-Montmorency was detached and merged with a part of the territory of Saint-Gratien, a part of the territory of Deuil-la-Barre, and a part of the territory of Épinay-sur-Seine to create the commune of Enghien-les-Bains.

• Racecourse: Hippodrome d'Enghien-Soisy
• Sports stadium: Stade Albert Schweitzer home of the FC Soisy-Andilly-Margency.

Soisy-sous-Montmorency is served by Champ de courses d'Enghien station on the SNCF Transilien Paris – Nord suburban rail line.

• Aristide Briand (1862–1932), statesman
• Ida Presti (1924–1967), classical guitarist and composer
• Georges Delerue (1925–1992), composer
• Alexandre Lagoya (1929–1999), classical guitarist
• Christian Noyer (b. 1950), economist
• Yann LeCun (b. 1960), American artificial intelligence researcher
• Emmanuel Renaut (b. 1968), chef (born in Soisy)
• Christophe Agnolutto (b. 1969), professional road bicycle racer (born in Soisy)
• Louis Saha (b. 1978), professional footballer (FC Soisy-Andilly-Margency)
• Ludwig Briand (b. 1981), actor (born in Soisy)
• Adrian Mannarino (b. 1988), professional tennis player (born in Soisy)
• Soilhyo Mété (b. 1988), Ivorian professional footballer
• Roxane Fournier (b. 1991), racing cyclist (born in Soisy)
• Thibault Rossard (b. 1993), volleyball player (born in Soisy)
• Alan Virginius (b. 2003) professional footballer (born in Soisy)

• Map of Soisy about 1780 (Dominique, comte de Cassini)
• Town hall
• Hippodrome d'Enghien-Soisy (2005)
• Church Saint-Germain and the Parc du Val-Ombreux

• Montmorency
• Communes of the Val-d'Oise department